Which number will replace question mark

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

The sum of numbers in each row is 15. the missing number in the 2nd row is 8.

1+5+6+3=15 4+8+1+2=15

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

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

Which number replaces the question mark - 12, 9, 7, 3, 4, 6, ??

Fill the Boxes with Numbers : 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 No Repetition