Directions : In the following Five Questions, select the missing number from the given responses.
9 11 13
13 15 17
10 12 14
14 16 18
11 13 ?
If + = ×, - = ÷ = -, then which is the correct equation out of the following
If, + stands for division, stands for addition; - stands for multiplication; + stands for substraction, which of the following is correct