what is answer to this problem

Mathematics
Tutor: None Selected Time limit: 1 Day

2-6

3-12

4-20

5-30-

6-42

9-????/

Sep 7th, 2015

Hello!

I suppose that you have to continue the sequence (i.e., understand the rule it is formed).

Also I suppose that the numbers at left are the numbers of the sequence terms.

Then consider (a_n)/n:
6/2 = 3
12/3 = 4
20/4 = 5
30/5 = 6
42/6 = 7
...

probably you see the pattern.

So (a_n)/n = n+1 and a_9 = 9*(9+1) = 90.

The answer: 90.

Please ask if anything is unclear.
Sep 7th, 2015

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Sep 7th, 2015
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Sep 7th, 2015
Dec 3rd, 2016
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