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Question:

2 , 3 , 8 , 63 , _____ ?

A1038

B3698

C3968

D3008

Answer:

C. 3968

Explanation:

2²- 1 = 3 3² - 1 = 8 8²- 1 = 63 63² - 1 = 3969 - 1 = 3968

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