number sequences

suram | 14:54 Mon 26th Jan 2009 | Riddles

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What are the next numbers in the following 2 sequences?
1,6,18,40,75,?
1,6,21,52,105,?

Ditlois

dingbats

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rov1200

I would say the first answer is 126

rov1200

And the second 186

suram

Question Author

How do you get that answer?

rov1200

If you start off taking the differences of each number, then take the differences of these numbers and thirdly take the differences of these you will either get 3,3,.....or 6,6 then work your way up to the next number.

suram

Question Author

Thanks Rov. Can you let me know how you reach the answers?

suram

Question Author

Get it! Thanks Rov!!

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