#### Answer : 7

In each circle multiply upper left number by 2 and subtract 1 to give upper right number. Similarly multiply upper left number with 3 and subtract 1 from it to get lower number.

In first two circles,

(6*2) – 1 = 11 and (6*3) – 1 = 17

(3*2) – 1 = 5 and (3*3) – 1 = 8

Similarly in third circle,

(4*2) – 1 = 7 and (4*3) – 1 = 11

So, answer is 7.