Question
Select the number from among the given option that can
replace the question mark (?) in the following series. 4, 21, 86, 261, 526, ?Solution
4 × 5 + 1 = 21 21 × 4 + 2 = 86 86 × 3 + 3 = 261 261 × 2 + 4 = 526 526 × 1 + 5 = 531
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