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📖 generic · CBSE Class 11 English medium · MATHEMATICS · Page 151poem

Evaluate (

Chapter 1: 1. ( ) · MATHEMATICS

Evaluate ( ! ! , when (i) n = , r = (ii) n = , r = . . . Derivation of the formula for n P r ! P ! , ≤ r ≤ n Let us now go back to the stage where we had determined the following formula: n P r = n ( n – ) ( n – ) . . . ( n – r + ) Multiplying numerator and denomirator by ( n – r ) ( n – r – ) . . . × × , we get

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