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 Post subject: Help with a Question Please?Posted: Sat Apr 03, 2010 4:05 pm

Joined: Mon May 19, 2008 9:39 pm
Posts: 522

Find the number that continues the sequence.

11,19,12,17,14,14,17

Correct answer is 10 - but I cannot see why!!??

I'm sure it's really obvious but can anyone help?

Thanks

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 Post subject: Posted: Sat Apr 03, 2010 4:09 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8598
2 alternating sequences

11, 12, 14, 17 = +1, +2, +3

and

19 17, 14 = -2, -3 so next would be -4 ie 10

next figures are 10 would be 21, 5

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 Post subject: Posted: Sat Apr 03, 2010 4:15 pm

Joined: Mon May 19, 2008 9:39 pm
Posts: 522
Thanks soooooo much - of course we can see it when pointed out!!

Thanks for the help

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 Post subject: Posted: Sat Apr 03, 2010 5:27 pm

Joined: Mon Nov 24, 2008 1:25 pm
Posts: 2556
whenever you get quite a long sequence, consider that it is two different runs of numbers, alternating, like here.

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 Post subject: Posted: Sat Apr 03, 2010 8:37 pm

Joined: Mon May 19, 2008 9:39 pm
Posts: 522
Milla wrote:
whenever you get quite a long sequence, consider that it is two different runs of numbers, alternating, like here.

Good tip - thanks

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 Post subject: Posted: Wed Apr 07, 2010 3:36 pm

Joined: Tue Sep 15, 2009 6:13 pm
Posts: 3
there are two sequences here.
sequence one :

sequence two

-------, 19, ------, 17,-----,14,------, { ? ] (minus 2,minus 3, and than the answer minus 4)
hope that helps

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 Post subject: Posted: Wed Apr 07, 2010 9:28 pm

Joined: Mon May 19, 2008 9:39 pm
Posts: 522
Thanks SG - It was really obvious when pointed out!!

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