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Three of the following four number-pairs are alike in a certain way and one is different. Find the odd one out.

A78 : 13

B18 : 9

C34 : 7

D56 : 11

Answer:

A. 78 : 13

Read Explanation:

1) 78 : 13 → 7 + 8 = 15 ≠ 13 2) 18 : 9 → 1 + 8 = 9 3) 34 : 7 → 3 + 4 = 7 4) 56 : 11 → 5 + 6 = 11


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