Questions
The number of ways in which 10 candidates can be ranked such that A1, is always above A10 is
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a
5!
b
2(5!)
c
10!
d
1210!
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Correct option is D
Two positions for A1, and A10 can be selected in 10C2 ways. Rest eight students can be ranked in 8! ways.Hence, total number of ways is 10C2×8!=(1/2)(10!)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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