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Which number spoils the pattern 10, 11, 15, 24, 42, 65?

Competition practiceNumber Series

A42
B15
C24
D65

Step-by-Step Solution

The differences should be

1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2} = 1

, 4, 9, 16, 25: 10, 11, 15, 24, 40, 65. So 42 should be 40.

Answer: A) 42

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