sananoor wrote:
How many positive 5-digit integer is divisible by 5 and have thousand, hundred and tens digit filled with different odd numbers?
a) 1080
b) 1200
c) 600
d) 540
e) 1000
Hi...
Five places..
1) first can be filled by any of digits except 0, so 1-9 ... 9ways
2) Thousands by any of 5 odd digits
3) Hundreds by remaining 4 odd digits
4) Tens by remaining 3 odd digits
5) ones by either 5 or 0, so 2 digits..
ANSWER 9*5*4*3*2=1080
A
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