if d = 1 / ( 2 ^ 3 * 5 ^ 9 ) is expressed as a terminating decimal , how many nonzero digits will d have ?
"another way to do it is : we know x ^ a * y ^ a = ( x * y ) ^ a given = 1 / ( 2 ^ 3 * 5 ^ 9 ) = multiply and divide by 2 ^ 4 = 2 ^ 6 / ( 2 ^ 3 * 2 ^ 6 * 5 ^ 9 ) = 2 ^ 6 / 10 ^ 9 = > non zero digits are 64 = > ans b"
add(1, 2)