Replace The Question Mark Below With Correct Number?

2 {38} 3 4 {1524} 5 6 {3548} 7 8 {????} 9

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Which number will replace question mark

1 5 6 3 4 ? 1 2 9 1 2 3 1 1 6 7

Can you replace the question mark with the correct letter? 6 + 6 + 6 = N 7 + 7 + 7 = E 8 + 8 + 8 = R 0 + 0 + 0 = ?

Calculate the number of ordered triples (A1, A2, A3) such that:

A1 ∪ A2 ∪ A3 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} A1 ∩ A2 ∩ A3 = ∅

Write your answer as 2a3b5c7d where a, b, c, d are non-negative integers.