Teaching UP TGT Mock Test Series 2025 Mathematics Permutations and Combinations

n-1Cr = (k2 - 8) nCr+1 if and only if:   

1
2√2 < k ≤ 3
2
2√3 < k ≤ 3√2
3
2√3 < k < 3√3
4
2√2 < k < 2√3
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