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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asked Sep 12, 2019 at 21:36
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2 Answers
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Is this the answer?
116
The pattern/reasoning is
(a^2 + b^2) -1 = answer
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$\begingroup$ 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. $\endgroup$ Sep 13, 2019 at 16:00
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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? $\endgroup$– BelhenixSep 12, 2019 at 23:18
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2$\begingroup$ 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? $\endgroup$– JS1Sep 12, 2019 at 23:18
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$\begingroup$ yes you were right there was an error in the puzzle $\endgroup$ Sep 13, 2019 at 1:37