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

4 টি চিঠি এবং 4 টি খাম আছে। কতভাবে ভুল পছন্দ করা যাবে?

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