Find the missing number. 3 2 = 7, 5 4 = 23, 7 6 = 79, 10 9 = ?

If

3 2 = 7 5 4 = 23 7 6 = 47 9 8 = 79

Then

10 9 = ??

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.

If the following is true, can you find the value of (4 + 9)?

7 + 7 = 2 8 + 8 = 4 8 + 5 = 1 6 + 9 = 3 10 + 11 = 9