What is the remainder when 85 × 87 × 89 × 91 × 95 × 96 is divided by 100?

What is the unit digit in the expansion of (57242)^{9×7×5×3×1}?

If ABC and DEF are both 3-digit numbers such that A, B, C, D, E and F are distinct non-zero digits such that ABC + DEF = 1111, then what is the value of A + B + C + D + E + F ?

D is a 3-digit number such that the ratio of the number to the sum of its digits is least. What is the difference between the digit at the hundred's place and the digit at the unit's place of D?