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In how many different ways can the letters of the word BOOKLET be arranged such that B and T always come together? (a) 360 (b) 720 (c) 480 (d) 5040 (e) None of these |
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Answer» (b) Treat B and T as a single letter. Then the remaining letters (5 + 1 = 6) can be arranged in 6! ways. Since, O is repeated twice, we have to divide by 2 and the B and T letters can be arranged in 2! ways. Total no. of ways= 6!x2!/2 =720 |
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