Question 1104887: Find the question mark in each sequence:
1. 7, 16, 8, 27, 9, ?
2. 2, 7, 26, 101, 400, ?
3. 7, 21, 8, 72, 9, ?
Found 3 solutions by richwmiller, greenestamps, josgarithmetic:
Answer by richwmiller(17219)   (Show Source):
Answer by greenestamps(13200)  (Show Source):
You can put this solution on YOUR website!
I got a laugh out of the other tutor's answer....
But his answer IS EXACTLY what you asked for...! ("find each question mark")
His answer, though, is as good as any answer you could have gotten for your question, because it is NEVER possible to know what the right answer is to ANY problem like this.
Without any instructions or any context to give us a clue as to what kind of sequences these are, you can put any number you want next in each sequence, and those answers will be as good as any other.
Since it is impossible to know the "right" answer to any problem like this, you should never find them on competitive exams; unfortunately, it happens.
As recreational problems, you can spend as much (or as little!) time as you want looking for a reasonable pattern -- but whatever pattern you might see still might not be the "right" one.
Answer by josgarithmetic(39618)  (Show Source):
You can put this solution on YOUR website! Only meaningful if you can find each pattern.
Look at #1.
n=1,n=3,n=4
are going +1 each.
See 7, 7+1, 7+2 for those in that order.
Not so clear for n=2, n=4, n=3.
That part looks like +11, but you cannot be sure. Do you think that the question mark for n=3 term should be 27+11=38 ?
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