railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Permutation and Combination

4 पत्र आणि 4 लिफाफे आहेत. तर किती प्रकारे चुकीच्या निवडी करता येतील?

1
43
2
4! - 1
3
16
4
44 - 1
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