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OtherPermutations and CombinationsNumerical Value Two DecimalVery Hard
Q9.\textbf{Q.9} Let S={1,2,3,...,10}S=\{1,2,3,...,10\}. Consider the set
X={R:R is an equivalence relation on the set S such that R has exactly 42 elements}.X=\{R: R \text{ is an equivalence relation on the set } S \text{ such that } R \text{ has exactly 42 elements}\}.
 Then the number of elements in XX is
Subjective / proof problem — work it out in the Scratchpad, then reveal the solution.
citeJEE Advanced · 2026 · Paper 1
2026id · 384f1efb
Subjective — no options to pick