Permutation of n different objects, taken r at a time (Formula 2)

Permutation of n different objects, taken r at a time questions

1. How many 5-letter code words can be formed from the letters of the word "SECONDARY"?

2. How many ways can a club of 10 members select a president, a vice president and a secretary, assuming that the same person cannot hold more than one post?

Permutation of n different objects under given condition

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Questions:

1) In how many ways can 3 science books and 4 mathematics books be selected from 5 science books and 7 mathematics books?

Combination of r different objects chosen from n different objects under given condition

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SPM Questions Permutation and Combination

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