Question

if 4 digit numbers greater than 5000 are randomly formed from the digits 1,3,5,7&0,what is the probability of forming a number divisible by 5 when, 1.the digits are repeated? 2.the repetition of digits is not allowed?

Answer 1

Isnt it 2/5

Answer 2

for 1st case

Answer 3

yes... please explain the steps...

Answer 4

To be divisible by 5 the last digit must be either 0 or 5

Answer 5

So, 2/number of different digits we can choose for the last digit = 2/5

Answer 6

so,what's the answer for 2 case??????????????

Answer 7

(1*1*3*2 + 1*2*3*2)/(2*4*3*2)

Answer 8

3/8

Answer 9

how did you get that !!!

Answer 10

If the first digit is 5 then the last digit must be 0
If the first digit is 7 then the last digit can be either 0 or 5

Answer 11

Which gives
No. of numbers divisible by 5 greater than 5000 = 1*1*3*2+1*2*3*2

Answer 12

And No. of numbers that can be formed greater than 5000= 2*4*3*2
as the first digit must be either 5 or 7

Answer 13

got it?

Answer 14

yes.thanks....
can you answer 1 more question please?

Answer 15

Okay.... but post it seperately