Math puzzles are a fun way to keep your brain sharp and active. Just like physical exercise is good for your body, mental exercise is very important for your brain health– that’s why missing number ...

E= (A+B) - (C-D) where A=7, B=5, C=6, and D=3 If you observe the sequence of table above, 1, 3, 5, 9, 11, 13 are increasing with a difference of 2 and 1, 2, 3, 5, 6 ...