Multiple Choice Questions on The average of the two digit numbers which remain the same when the dibits inter change their positi........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The average of the two digit numbers which remain the same when the dibits inter change their positi...........

Quant (SSC) Average
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    The average of the two-digit numbers, which remain the same when the dibits inter-change their positions, is :

    52

    Incorrect Answer

    65

    Incorrect Answer

    56

    Incorrect Answer

    55

    Correct Answer
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    Explanation:

    Average = (11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99) / 9
    =( (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55) / 9
    = (4 * 110 + 55)/9 =  495 / 9 = 55

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