Multiple Choice Questions on Consider two digit numbers which remain the same when the digits interchange their positions What is........... for CDS Exam Preparation

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Multiple Choice Questions

Consider two digit numbers which remain the same when the digits interchange their positions What is...........

Quantitative Aptitude (CDS) Number System
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    Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?

    33

    Incorrect Answer

    44

    Incorrect Answer

    55

    Correct Answer

    66

    Incorrect Answer
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    Explanation:

    All such 2 digit numbers are 11,22,33,44……. upto 99

    Forms an AP So sum = n/2(a+l) = 9/2(11+99)

    Average = sum/9 = ½(11+99) = 55

    By: Munesh Kumari
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