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By Wiki Mathematics Mcqs Odd Man Out Series Mcqs No Comments

Find the one which does not belong to that group ?

A. 20
B. 42
C. 58
D. 72

Explanation:

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20 = 4² + 4, 42 = 6² + 6, 58 = 7² + 9, 72 = 8² + 8 and 90 = 9² + 9.

20, 42, 72 and 90 can be expressed in n² + n form but not 58.

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