Question

how many four digit numbers,divisible by 5, can be formed with the digits 0,4,3,5,7 and 9 if repetition is allowed​

Answer 1

Step-by-step explanation:

_ _ _ _

• the last can be filled with 2 numbers i.e.,0,5
• so,the last place can be filled in 2 ways...
• the first place can be filled with 5 numbers i.e.,4,3,5,7,9....
• the first place can be filled in 5 ways...
• the middle 2 digits can be filled in6*6 ways...
• the total no. of 4 digit no.s are...
• 5*6*6*2=360