Question

if 2*5=16,6*9=64and 4*5=25,then 2*9=?​

Answer 1

if 2*5=16,6*9=64and 4*5=25,then 2*9= 36

Step-by-step explanation:

if 2*5=16,6*9=64and 4*5=25,then 2*9=?​

2*5=16

=> {(2 + 5 + 1) /2 }²

= (8 / 2)²

= 4²

= 16

6*9=64

=> {(6 + 9 + 1) /2 }²

= (16 / 2)²

= 8²

= 64

4*5=25

=> {(4 + 5 + 1) /2 }²

= (10 / 2)²

= 5²

= 25

2*9=?​

=> {(2 + 9 + 1) /2 }²

= (12 / 2)²

= 6²

= 36

Logic is  

a * b  = c

=> c = { (a + b + 1)/2}²