Question
In each of the following series, one term is missing.
Find the missing term. 1, 2, 6, 21, 88, ?Solution
1 → 2: 1 × 1 + 1 = 2 2 → 6: 2 × 2 + 2 = 6 6 → 21: 6 × 3 + 3 = 21 21 → 88: 21 × 4 + 4 = 88 Pattern: term ₙ = term ₙ₋₁ × n + n Next (n = 5): Missing term = 88 × 5 + 5 = 440 + 5 = 445
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