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In a class of 10 students there are 3 girls students. The number of ways in which they can be arranged in a row, so that no two girls are consecutive is , then is equal to
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a
12
b
24
c
36
d
42
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Correct option is D
Seven boys can be arranged in 7! ways. If XB1XB2XB3XB4XB5XB6XB7Xs one such arrangement, then 3 girls can be arranged at any of the 3 places marked with a X. the number of arrangements is 8P3(7!)=(6×7)(8!)=(42)(8!) Thus, K = 42.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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