Multiple choice How many words can be formed by taking four different letters of the word MATHEMATICS? 7,920 1,680 70 180 None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation MATHEMATICS has 11 letters: M, A, T, H, E, I, C, S (8 unique). We need to choose 4 different letters from 8: 8C4 = 70. Each set of 4 can be arranged in 4! = 24 ways. Total = 70 * 24 = 1680.