Question
What will come in place of (?) in the given number series.
1, 2, 6, 21, 88, ?Solution
ATQ,
Check differences:
1 × 1 + 1 = 2
2 × 2 + 2 = 6
6 × 3 + 3 = 21
21 × 4 + 4 = 88
88 × 5 + 5 = 445
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