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Question

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

11, 36, 147, ? , 1779, 5340, 21363

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

444

In a missing-term series we identify the rule that links each term to the next and then apply it at the gap.

The operations alternate: multiply by 3 and add 3, then multiply by 4 and add 3, repeating in that order.

Check the start: \(11 \times 3 + 3 = 36\), and then \(36 \times 4 + 3 = 147\).

The missing term comes after 147, so it uses the '×3 + 3' step: \(147 \times 3 + 3 = 444\).

Verify forward with '×4 + 3': \(444 \times 4 + 3 = 1779\), which matches the next given term.

Continuing, \(1779 \times 3 + 3 = 5340\) and \(5340 \times 4 + 3 = 21363\), both matching the series.

The consistent verification on both sides confirms the value at the gap.

Hence the missing term is 444.

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Important Questions from Number Based

  1. In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

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