How many 7 digit number are there having the digit 3 three times & the digit 0 four times ?	Choose the correct choice from the following.
A) 15 B) 3^3 * 4^4 C) 18 D) 19 E) 25
The first digit on the left for 7 digit would always be fixed to 3 (as 0 as first digit will no longer makes it a 7 digit number).   So we are left with 6 places to be filled by number 3 two times and number 2 four time.   So possible arrangements at 6 place for repetitive numbers would be = 6! / 4!*2! = 15   15NSWER:15
<result>A</result>
How many 7 digit number are there having the digit 3 three times & the digit 0 four times ?