Permutations and Combinations
Counting principles, nPr/nCr and elementary combinatorial reasoning.
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Take a full mock →Q1 · Permutations and Combinations · EASY
The number of ways to arrange 4 distinct objects in a row is:
Q2 · Permutations and Combinations · EASY
The number of ways in which 5 different books can be arranged on a shelf such that two particular books are always together is: