Question

How many 7-digit numbers are there having the digit 5 three times & the digit 0 four times?​

Answer 1

Answer:

I hope it's help you

Step-by-step explanation:

7 digits

first one should be three since .. 0 cannot occupy first digit.

3_ _ _

Now .. the no. of ways of filling these is 6!

Also .. we have 2 Times 3.. and 4 times 0

6! /(2! 4! )

15

Note : late I said we have only two 2 threes .. because one three is fixed at the first position .