Multiple Choice Questions

Which number will replace the question mark in the following number series 1 11 21 1211 3112 ........

Logical Reasoning (MTS) Number series

Which number will replace the question mark (?) in the following number series?

1, 11, 21, 1211, 3112, ?

This questions was previously asked in

SSC MTS 14th October 2021 Shift-2

113121

132112

311221

321121

The series is a variation of the "look-and-say" sequence:

- 1: Described as "one 1" ? Next term is 11.

- 11: Described as "two 1s" ? Next term is 21.

- 21: Described as "one 2, one 1" ? Next term is 1211.

- 1211: Described as "one 1, one 2, two 1s" ? Next term is 3112.

- 3112: Described as "one 3, two 1s, one 2" ? Next term is 132112.

- Option:1, 113121: Does not follow sequence logic.

- Option:2, 132112: Follows the sequence logic.

- Option:3, 311221: Does not follow sequence logic.

- Option:4, 321121: Does not follow sequence logic.

The correct answer is Option:2, 132112

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