In how many different ways can the letters of the word ‘GRINDER’ be arranged? (A) 2520 (B) 1280 (C) 3605 (D) 3454►Correct Option Correct Option is: AIn these 7 letters, ‘R’ occurs 2 times, and rest of the letters are different. Hence, number of ways to arrange these letters = {7!} / {(2!) } = {7×6×5×4×3×2×1} / {2×1} = 2520.