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Permutations and Combinations question

2025 · Shift 1 · Q24

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PYQ Library
JEE Advanced
Mathematics
Permutations and Combinations
2025 · Shift 1 · Q24

Permutations and Combinations question

2025 · Shift 1 · Q24

JEE AdvancedMathematicsPermutations and CombinationsNumerical+4 / −1

Let the set of all relations

R

on the set

\{a, b, c, d, e, f\}

, such that

R

is reflexive and symmetric, and

R

contains exactly

10

elements, be denoted by

\mathcal{S}

. Then the number of elements in

\mathcal{S}

is

\underline{\hspace{2cm}}

.

Numerical answer

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