Question

4*6=21
5*8=36
6*3=20
8*7=56
5*10=44
4*4=?

Answer 1

Answer:

4*4=3*5=15

in the given examples

it is clear that they are in the form of x*y=(x-1)*(y+1)

Answer 2

We have:

4*6 = 21 , 5*8 = 36 , 6*3 = 20 , 8*7 = 56, 5*10 = 44

We have to find the value of 4*4 = ?

Solution:

The pattern follow:

(First number - 1) × (Second number + 1)

4*6 = (4 - 1) × (6 + 1)

= 3 × 7 = 21

5*8 = (5 - 1) × (8 + 1)

= 4 × 9 = 36

6*3 = (6 - 1) × (3 + 1)

= 5 × 4 = 20

8*7 = (8 - 1) × (7 + 1)

= 7 × 8 = 56

5*10 = (5 - 1) × (10 + 1)

= 4 × 11 = 44

Similarly,

4*4 = (4 - 1) × (4 + 1)

= 3 × 5 = 15 = ?

∴ The missing number (?) = 15