Questions
How many 10-digit numbers can be written by using the digits 1 and 2 ?
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a
10C1+9C2
b
210
c
10C2
d
10!
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Correct option is B
Each digit can be placed in 2 ways.∴ Required number of ways = 210Similar 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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