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1. |
The value of n, when np2 = 20 is: (a) 3 (b) 6 (c) 5 (d) 4 |
Answer» (c) 5 nP2 = 20 n(n – 1) = 20 n(n – 1) = 5 x 4 ∴ n = 5 |
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