Question

1+2=21
2+3=36
3+4=43
4+5=?
​

Answer 1

Answer:

54

Step-by-step explanation:

1+2=21 to vese hi same 4+5= 54

Answer 2

The missing number(?) is "400".

Step-by-step explanation:

We have,

1 + 2 = 21 , 2 + 3 = 36,  3 + 4 = 43

To find, 4+5= ?

The pattern follow,

(Reverse numbers), $(Product of numbers) ^{2}$, (Reverse numbers), $(Product of numbers) ^{2}$, ........

1 + 2 = 21

2 + 3 = $(2\times 3)^{2}$ = $(6)^{2}$ = 36

3 + 4 = 43

Similarly,

? = $(4\times (5)^{2}$ = $(20)^{2}$ = 400

Hence, the missing number(?) is "400".