In the above picture, one number is missing in one of the circle. Can you find the missing number using simple logic. It is a little bit hard problem then the other problems.
The missing number is 548
First circle: GCF(21,14)=7,GCF(18, 9)=9,GCF(33,6)=3. So the number is 793. Where GCF means greatest common factor.
Second circle: GCF(13,7)=1,GCF(10,5)=5,GCF(39,12)=3. So the number is 153. Where GCF means greatest common factor.