Divisibility Tests

Find the remainder when 10^7 + 10^5 + 10^3 + 10 is divided by 9.

• 0
• 1
• 4
• 7

Find all digits x (0–9) such that the three-digit number 2×4 is divisible by both 3 and 4.

• 0
• 2
• 4
• 6
• 8