Find the Correct result Whatsapp status puzzle

Find the Correct result Whatsapp status puzzle

Find the correct result.
Remember that the maths is exact. 👌
1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
5 + 8 = ....

If you answer wrong you must
upload it to the status

I Lost to www.puzzles-world.com

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Logically answer is 45.