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govind_raj_76
- Senior | Next Rank: 100 Posts
- Posts: 32
- Joined: Tue Apr 20, 2010 7:16 pm
- Location: Newark, DE
IMO A
we have to form a-digit number from 1,2,3,5,6,7,9,0
No numbers can be repeated and number must be divisible by 5
So, last digit is either 0 or 5
Last Digit 5 -
First digit can't be 0
first digit can be selected from 1,2,3,6,7,9 = 6 ways
second digit can be selected again in 5+1 ways (now we can use the 0)
third digit can be selected in 5 ways
therefore 6*6*5
Similarly,
Last Digit 0
7*6*5
Total 5*6*(6+7)=390
HTH
