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If 3 * 4 = 25 and 5 * 6 = 61, then following the same rule 7 * 8 = ?

Competition practiceReasoning & Mental Ability

A113
B121
C105
D109

Step-by-Step Solution

The rule is

a * b = a^{2} + b^{2}

. Check:

3^{2} + 4^{2} = 25

and

5^{2} + 6^{2} = 61

. So

7^{2} + 8^{2} = 49 + 64 = 113

.

Answer: A) 113

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