Last night I spent the evening with some of my family who live nearby. I cooked a big pot of chicken and sausage gumbo, and we had a fantastic time catching up.
As I sat down on the couch after devouring a sugar cookie for dessert, my uncle handed me one of those big legal note pads. On it was a brain teaser that a friend had sent him via email. In my sugared brain fog, I worked through it and thought I would share it with you.
Look at the following series of numbers and determine which number goes in place of the question mark.
2,3,10
3,4,21
4,5,36
5,6,55
6,7, ?
You can post your answers in the comments below, and then check the solution to see if you were correct.
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About the author, Erin Matlock
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161 Comments On This Post
78
78
easy stuff… 78
78
Actually you can just add 4 to the last number in each sequence. Answer is still 78.
I got the pattern in less than 10 seconds but screwed up multiplying (6+7)*6. Got 252 after multiplying 6*7 and again by 6, lol.
the answer is 78.
78, I got this very fast, I’ve noticed the 10, and the 21, and then, all the things came into my mind
The answer is 78. I feel so smart. lol
78
78
The answer is 78 because the pattern is:
2+3=5*2=10
3+4=7*3=21
4+5=9*4=36
5+6=11*5=55
6+7=13*6=78
the answer has to be 78
78
78
78
i got the answer 78 tbh wasn’t that hard i was clearing out my inbox and i was going through my old emails when i found the teaser. The pattern was pretty clear :) 6 + 7 = 13 * 6 = 78
78
2+3=5. multiplying this with 1st term(2) we get 10.
likewise 3+4=7, 7*3=21
4+5=9, 9*4=36
5+6=11, 11*5=55
6+7=13, 13*6=78
so the answer we got is 78
69
pattern is first value + second value = result X first value
6+7 = 13 (6) = 78
2+3=5*2=10
3+4=7*3=21
4+5=9*4=36
5+6=11*5=55
6+7=13*6=78
so the answer is 78.
The answer is 78
2+3=5;5*2=10
3+4=7;7*3=21
4+5=9;9*4=36
5+6=11;11*5=55
6+7=13;13*6=78
?=73
2+3=5, 5*2=10
3+4=7, 3*7=21
4+5=9, 4*9=36
5+6=11, 5*11=55
6+7=13, 6*13=78
so, ?=78
78
2*3=6+(2*2)=10
3*4=12+(3*3)=21
4*5=20+(4*4)=36
5*6=30+(5*5)=55
6*7=42+(6*6)=78
78
The answer is 78.
60
answer is 78
78 (6+7= 13 X6)
23