1, 5, 14, 30, 55,........?

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1, 5, 14, 30, 55,........?

A5

B50

C55

D91

Answer:

D. 91

Read Explanation:

1 =1² 5 = 1²+2² 14 =1² + 2²+3² 30=1² + 2² + 3² + 4² 55 =1² + 2² + 3² + 4² + 5² 1² + 2² + 3² + 4² + 5² + 6² = 91

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