Multiple Choice Questions on a b 1 b c 2 and c a 3 then the value of a3 b3 c3 3abc a b c is ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

a b 1 b c 2 and c a 3 then the value of a3 b3 c3 3abc a b c is ........

Quantitative Aptitude ( CCS) Number System
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    (a-b) = 1, (b-c) = 2 and (c-a) = 3 then the value of (a3+b3+c3-3abc)/(a+b+c) is

    5

    Incorrect Answer

    6

    Incorrect Answer

    7

    Correct Answer

    8

    Incorrect Answer
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    Explanation:

    (a3+b3+c3-3abc)/(a+b+c)
    = 1/2[(a-b)2+(b-c)2+(c-a)2]
    = ½(1+4+9) = 14/2 = 7

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