Q14.In how many different ways can 4 books a, b, c and d be arranged one above another in a vertical order such that the books a and b are never in continuous position?
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Answer:
12
Step-by-step explanation:
total ways to arrange 4 books = 4! = 24
if a and b come together, total ways = 3! × 2 = 6×2 =12
So total.ways in which a and b don't come together = 24 - 12 = 12
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