Questions
The number of 4-digit numbers with distinct digits is
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a
504
b
4536
c
4634
d
5040
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Correct option is B
Number of ways to fill thousand’s place = 9Number of ways to fill hundred’s place = 9Number of ways to fill ten’s place = 8Number of ways to fill unit place = 7∴ 9×9×8×7=4536Similar 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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