Counting principle, nPr, nCr, applications.
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Q1 · Permutations and Combinations (1st PUC) · MEDIUM
The number of ways in which 5 different books can be arranged on a shelf is
Q2 · Permutations and Combinations (1st PUC) · HARD
The number of 4-letter words (with or without meaning) that can be formed using the letters of the word 'EQUATION' without repetition is