Which number will be part of last circle in place of question mark ?

Question

Answer 1

13 because sum of next diagonal numbers is 22 and the next one 30. therefore this diagonal should add to 14.

Answer 2

increament of 4..then ans is 13.

Answer 3

13 will be the answer.
add 4 in the previous number.

Answer 4

The number will be 13

Answer 5

13 will be part of last circle in place of question mark.

Answer 6

correct answer is 13

Answer 7

The step is 4 so the answer is 9+4=13