A three digit number is to be formed using the digits 3,4,7,8 and 2 without repetition.The probability that it is an odd number is
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Three places of a 3 digit number can be filled by using 5 digits in
=5×4×3=60 ways.
Number will be odd when either of 3 or 7 is at unit's place.
When 3 is at unit's digit, then remaining 2 places can be filled by using remaining 4 digits in =4×3=12ways
Similarly, no. of ways when 7 is at unit's place =12
Favourable no. of ways =12+12=24
∴required probability =24/60=2/5
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