Find the missing number in the last circle
Answer : 42
Divide each circle into left and right halves. The top right value equals the sum of the left hand numbers, the middle right value equals the product of the left hand numbers and the bottom right hand value equals the sum of the squares of the left hand numbers.
In first circle,
Similarly in third circle, 1+ (5^2) + (4^2) = 42
So, answer is 42.