defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Permutations and Combinations Permutation Function and its properties

यदि \(\rm ^{(n+2)}C_8:^{(n-2)}P_4=57:16\), n का मान ज्ञात करें ।

1
21
2
18
3
19
4
20
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