Find the missing number. ?, 12, 55; 9, 7, 4; 61, 6, 31

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

Which number will replace the "?" and complete the sequence?

1; 1; 2; 4; 3; 9; 4; 61; 5; 52; 6; 63; 7; ?