Questions
The number of permutations of the letters a, b, c, d such that b does not follow a, c does not follow b, and d does not follow c, is
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a
12
b
14
c
13
d
11
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Correct option is D
∴ Total number of ways = 11.Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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