JEE Main Maths · Permutations and Combinations

Non-Consecutive Selection in a Row

Non-Consecutive Selection in a Row (Permutations and Combinations) was asked once in the 42 JEE Main shifts Lumi analysed, in 2025. 1 of the 1 had a numerical answer.

Times asked: 1; in 1 shift
Years: 2025
Usual format: Numerical value; Multi-step
Pattern: New since 2024; asked once so far

How it is asked

Count subsets with no consecutive elements

Difficulty

Easy 0Medium 1Hard 0

Where it sits

Chapter: Permutations and Combinations. Topic: Permutations and Combinations, 50 questions over 22 ideas.

The question

Newest first, each with its options and official answer.

7 Apr 2025, Shift 1 · Q21For $n \geq 2$ , let $S_n$ denote the set of all subsets of $\{1, 2, \ldots, n\}$ with no two consecutive numbers. For example…MediumNumerical value