How many 7 digit number are there having the digit 3 three times & the digit 5 four times?  Pick
A) 7!/(3!)(5!) B) 3^3 * 5^5 C) 77 D) 35 E) 38
Explanation :   7!/3!*4!=35   Answer : 35
<result>D</result>
How many 7 digit number are there having the digit 3 three times & the digit 5 four times?