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    You are at:Home»Pure Math»Algebra»Progressions»Arithmetic Mean Formula | Practice Questions for Arithmetic Mean
    Concept, formula with examples for Arithmetic Mean | practice questions for arithmetic mean

    Arithmetic Mean Formula | Practice Questions for Arithmetic Mean

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    By sivaalluri on August 26, 2019 Progressions

    In this article explained about Definition, Properties, Formula and Examples with Solutions of Arithmetic Mean

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    • Basic Concept, formula with examples for Arithmetic Mean
      • Properties of Arithmetic Mean

    Basic Concept, formula with examples for Arithmetic Mean

    The arithmetic mean “A” of any two quantities of ” a” and ” b”. Then

     A = \frac{a+b}{2}

    Here a, A, b are in A.P . We much have b – A = A- a ; Each being equal to the common difference

    For any given two quantities it is always possible to insert any number of terms such that the whole series thus formed shall be in A.P. Then terms thus inserted are called the Arithmetic mean.

    Properties of Arithmetic Mean

    1. Mathematically Arithmetic Mean is also called the average of quantities

      \text{Arithmetic Mean} = \frac{\text{Sum of terms}}{\text{Number of terms}}

    i.e If r1, r2, r3, r4, . . . . .  rn be an finite A.P with n terms. Then arithmetic mean “A” of these numbers is given by

    A = (1/n) [ r1 + r2 + r3 + r4,+. . . . .  + rn ]

    1. The “n” numbers r1, r2, r3, r4, . . . . .  rn  are said to be an arithmetic mean between “a” and “b” if a, r1, r2, r3, r4, . . . . .  rn, b  are in A.P

    Here, the common difference of the above A.P is  d = \frac{b-a}{n+1}

    r1 + r2 + r3 + r4,+. . . . .  + rn    = n \left[ \frac{a + b}{2} \right]

     r_{1} = a + \left[ \frac{b - a}{n+1} \right]
     r_{2} = a + \left[ \frac{2(b - a)}{n+1} \right]
    similarly  r_{n} = a + \left[ \frac{n(b - a)}{n+1} \right]

    2. Selection of the terms in an Arithmetic Progression

    If the number of terms is 3, then assume them as ” a-d, a & a+d” and the common difference is  “d”

    If the number of terms is 4, then assume them as  ” a-3d, a-d, a+d & a+3d ”  and the common difference is  “2d”

    If the number of terms is 5, then assume them as  ” a-2d, a-d, a, a+d & a+2d ”  and the common difference is  “d”

    If the number of terms is 6, then assume them as  ” a-5d, a-3d, a-d, a+d ,  a+3d & a+5d ”  and the common difference is  “2d”

    Arithmetic Mean Examples

    Example-1: In an A.M, the sum of three consecutive terms is -3, and their product is 8. Then, find the terms.

    Solution: Let the terms of A.M is, a, b, & c

    According to the A.M formula

    a + c = 2b  . . . . . .  ( i )

    a + b + c = -3 . . . . . .  ( ii )

    abc = 8 . . . . . .  ( iii )

    From equation ( i ) & ( ii )  b = -1

    From equation ( ii ) , ( iii )  & b = -1

    a = 2  and  c = -4

    So the sequence is 2, -1, -4

    Example- 2: Find the Arithmetic mean of numbers 1/2 and 1/3

    Solution:  \text{Arithmetic Mean} = \frac{\text{Sum of terms}}{\text{Number of terms}}

    Arithmetic mean = [ (1/2) + (1/3) ] / 2 = 5/16

    Example – 3: Find the second term of the given A.M terms  \frac{1}{\log_{3} 2} , X  ,  \frac{1}{\log_{12} 2}

    Solution: The terms can be rewritten as log2 3 , X,   log2 12

    ⇒ 2X = log2 3 +  log2 (4 x 3) = log2 3 +  log2 4 + log2  3

    ⇒ 2 X = 2 ( log2 3) +   2 log2 2

    ⇒ 2 X = 2 ( log2 3) +   (2 x 1 )

    ⇒ X =  log2 3 +   1  = log2 3 + log2 2 = log2 6

    Example – 4: If  10-r , a , r +2  are the consecutive terms of an A.P then find the value of ” a” 

    Solution: Given consecutive terms are 10-r , a , r +2 

    According to the formula of Arthritic mean

    ⇒ (10-r ) + ( r +2 ) = 2a

    ⇒ 12 = 2a ⇒ a = 6

    Example – 5: If (a+2), (4a -6) & (3a -2) are the consecutive terms of an A.P, then find the value of ” a”

    Solution: Given consecutive terms are (a+2), (4a -6) & (3a -2)

    According to the formula of Arthritic mean

    ⇒ (a+2) + (3a -2) = (4a -6)

    ⇒ 4a = 12 ⇒ a = 3

    Example – 6: If  1/a , 1/b and 1/c are in A.P then bc, ca & ab are also in A.P

    Solution: Given consecutive terms are 1/a , 1/b and 1/c are in A.P

    Multiplying the above terms with ” abc”

    Then abc/a , abc/b and abc/c  are in A.P

    So bc , ca & ab are in A.P

    Example – 7: If  a,b & c are in A.P then 1/bc, 1/ca & 1/ab are also in A.P

    Solution: Given consecutive terms are a, b & c are in A.P

    Multiplying the above terms with “1/abc”

    Then a/abc , b/abc  &  c/abc  are in A.P

    So 1/bc, 1/ca & 1/ab are in A.P

    Example -8: If  1/a,1/b  & 1/c terms are in arithmetic progression then the terms of  b+c/a, c+a/b & a+b/c are also in A.P

    Solution: Given consecutive terms are 1/a , 1/b & 1/c are in A.P

    Multiplying the above terms with ” a+b+c”

     a+b+c/a , a+b+c/b &  a+b+c/c are also in A.P

     1 + \frac{b+c}{a}, \quad 1 + \frac{a+c}{b}, \quad 1 + \frac{a+b}{c}   are in A.P

    Add ” -1″ to all terms then

     \frac{b+c}{a}, \quad \frac{a+c}{b}, \quad \frac{a+b}{c}   are in A.P

    Example – 9: If  1/a,1/b,1/c terms are in arithmetic progression then the terms of  b+c-a/a, c+a-b/b, a+b-c/c are also in A.P

    Solution: Given consecutive terms are 1/a , 1/b &  1/c are in A.P

    Multiplying the above terms with ” a+b+c”

     a+b+c/a , a+b+c/b and a+b+c/c are also in A.P

     1 + \frac{b+c}{a}, \quad 1 + \frac{a+c}{b}, \quad 1 + \frac{a+b}{c}   are in A.P

    Add ” -2″ to all terms then

     \frac{b+c}{a} -1, \quad \frac{a+c}{b} -1, \quad \frac{a+b}{c} -1   are in A.P

     \frac{b+c}{a} - \frac{a}{a}, \quad \frac{a+c}{b} - \frac{b}{b}, \quad \frac{a+b}{c} - \frac{c}{c}   are in A.P

     \frac{b+c-a}{a}, \quad \frac{a+c-b}{b}, \quad \frac{a+b-c}{c}   are also in A.P

    Example -10: If a, b & c  terms are in arithmetic progression, then the terms of  b+c, c+a , a+b are also in A.P.

    Solution: The given terms are a, b & c in A.P

    According to the Arithmetic mean formula

    a + c = 2 b . . . . . . . .  ( i )

    Take the terms b+c, c+a , a+b 

    Add the 1st and 3rd terms of the above

    i.e (b + c )+ (a +b) = (a +c) + 2b

    Now substitute equation  (i) in the above

    (a +c) + 2b  = (a +c) + (a +c)  =  2(a +c)

    So The terms b+c, c+a , a+b are in A.P.

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