Teaching UP TGT Mock Test Series 2025 Mathematics Permutations and Combinations Permutation Function and its properties

यदि 2nC3 : nC2 = 44 : 3 है, तो r के निम्नलिखित में से किस मान के लिए nCr का मान 15 होगा?

1
r = 3
2
r = 4
3
r = 6
4
r = 5
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