6
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What is the missing number that should be put in place of the question mark?

3,3=17

2,5=28

3,4=24

4,5=40

5,8=88

6,11=156

6,9=?

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6
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Is this the answer?

116

The pattern/reasoning is

(a^2 + b^2) -1 = answer

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  • 1
    $\begingroup$ No brackets needed. $\endgroup$ – curiousdannii Sep 13 '19 at 6:44
  • $\begingroup$ Good point. Clearly it's been a while since I worked on orders of operations. Guess it's just a little window into how I was thinking about the answer. $\endgroup$ – MobileGlick Sep 13 '19 at 16:00
7
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If the three numbers in each "equation" are $a$, $b$, $c$ then one possible solution is

$Min(a, 5)^2 + b^2 - 1 = c$, giving the answer $c = 105$ for the last.

Edit

For good measure, the corrected version of the puzzle has the simpler solution

$a^2 + b^2 - 1 = c$, giving the answer $c = 116$ for the last.

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  • $\begingroup$ It doesnt work for 6,11 but fits all others. Maybe there was a typo? $\endgroup$ – Belhenix Sep 12 '19 at 23:18
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    $\begingroup$ It works. But I wonder if "6,11 = 146" was meant to be "6,11 = 156" which would remove the need for the whole "Min" part of it which seems a bit arbitrary? $\endgroup$ – JS1 Sep 12 '19 at 23:18
  • $\begingroup$ yes you were right there was an error in the puzzle $\endgroup$ – Prince Deepthinker Sep 13 '19 at 1:37

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