# Number Puzzle #168

If 1 + 2 = 13

2 + 3 = 61

3 + 4 = 193

Then 4 +5 = ?

Check your answer:-

**Answer**: 481

**Explanation**:

A+B = (A*B + 2)^2 – 3

Answered by: in disqus comments.

(**8** votes, average: **4.38** out of 5)

If 1 + 2 = 13

2 + 3 = 61

3 + 4 = 193

Then 4 +5 = ?

Check your answer:-

Nelson DSouza says

https://uploads.disquscdn.com/images/4e7e432a46449b26087b7a9334dac21d44e972a355ba6b801c1124f5e8573d10.png

Prabu Sekkaaran says

super sir.. nice explanation

pega exchange says

481

First Line(1+2=13)

1*2+2=4

4^2(i.e 4*4)=16

16-3=13.

Second Line(2+3=61)

2*3+2=8

8^2(8*8)=64

64-3=61

Similarly the rest follows.

Ashwani says

241

Prabu Sekkaaran says

How? can you explain?

Ashwani says

Just add 2nd and 3rd, and then subtract 1st, u’ll get the answer

Prabu Sekkaaran says

why? what is the logic is this