Permutations Practice Test 1

Number of ways of attempting the 1st, 2nd and3rd questions are each.
Total number of ways = 4 × 4 × 4 = 64
Number of ways of getting all the correctanswers = 1 . 1 . 1 = 1
∴ Number of ways of not getting all the answers correct = 64 - 1 = 63