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Find the missing term: 4, 9, 25, 49, ?, 169

Competition practiceNumber Series

A100
B81
C121
D144

Step-by-Step Solution

Squares of successive primes:

2^{2}, 3^{2}, 5^{2}, 7^{2}, 1 1^{2}, 1 3^{2}

; the missing one is

1 1^{2} = 121

.

Answer: C) 121

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