IF

1,3,3=5

9,7,4=8

11,14,10=15

20,16,12=18

Than

3,6,7=?

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Answer is either 2 or 1 more than the middle term. To decide if it's 2 or 1 more than the middle term we can check the difference between the 1st and 3rd term, and if it's even it's 2 more and if it's odd it's 1 more.

For instance in

9,7,4 the answer could have been 7+1=8 or 7+2=9. But since

9 - 4 = 5 (odd) the answer will be 7+1 = 8

So for 3,6,7 it will be 6+2 = **8** because 3-7 = -4 (even)

The last answer is the correct one.

Sorry sir.It's wrong.The system is not accepting the answer in my playstore app.Please give me a better answer

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