Atleast two digits are odd=Exactly 2 digits odd+exactly 3 digits odd For exactly three digits are odd =5×5×5=125 For exactly two digits odd : If 0 is used then no of 3 digit numbers with 2 odd digits =2×5×5=50 If 0 is not used then no of 3 digit numbers with 2 odd digits =3C1×4×5×5=300 Required Probability =