How many 7-digit numbers are there having the digit 3(three times ) and the digit 0(four times ) ?
A
15
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B
33×44
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C
30
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D
None of these
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Solution
The correct option is A 15 d1
is 3 because we have to form 7 digit number now we have rest six boxes d2,d3,d4,d5,d6,d7
to be filled, this can be done in