Question

1+2=5 2+3=13 3+4=25 then 2+4=?

Answer 1

Answer:

2 + 4 = 9

Step-by-step explanation:

The equations in the question follow the following formula

$a + b = (2ab) + 1$

So we can get the results as follows;

1+2 = (1 x 2 x 2) + 1 = 5

2+3 = (2 x 2 x 3) + 1 = 12 + 1 = 13

3+4 =(2 x 3 x 4) + 1 = 24 +1 = 25

Therefore,

2 + 4 = (2 x 2 x 4) + 1 = 8 + 1 = 9

Hence answer is  

2 + 4 = 9