Questions
The number of natural numbers less than which can be formed by using the digits (repetition is allowed) is equal to
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a
250
b
374
c
372
d
375
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Correct option is B
Thousands place can be filled in 3 ways and each of the remaining places can be filled in 5 ways. Hence, required number of natural numbers is3×5×5×5−1=374Similar 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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