how many three - digit numbers that do not contain the digits 2 or 5 are there ?
"we can have 7 digits ( 1 , 3,4 , 6,7 , 8,9 ) for the first place ( hundred ' s place ) . and similarly 8 digits for tenth ' s and unit digit . ( 0,1 , 3,4 , 6,7 , 8,9 ) so in total 7 * 8 * 8 = 488 hence b"
multiply(multiply(multiply(const_10, const_10), subtract(const_10, const_1)), 5)