Help with a Question Please?

Advice on 11 Plus VR papers and problems

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Booklady
Posts: 522
Joined: Mon May 19, 2008 10:39 pm

Help with a Question Please?

Post by Booklady »

Can anyone answer this one please ....

Find the number that continues the sequence.

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

Answer options are : 8,10,12,14,17

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

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

Thanks :?
hermanmunster
Posts: 12817
Joined: Fri Sep 15, 2006 9:51 am
Location: The Seaside

Post by hermanmunster »

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
Booklady
Posts: 522
Joined: Mon May 19, 2008 10:39 pm

Post by Booklady »

Thanks soooooo much - of course we can see it when pointed out!! :oops:

Thanks for the help
Milla
Posts: 2556
Joined: Mon Nov 24, 2008 2:25 pm

Post by Milla »

whenever you get quite a long sequence, consider that it is two different runs of numbers, alternating, like here.
Booklady
Posts: 522
Joined: Mon May 19, 2008 10:39 pm

Post by Booklady »

Milla wrote:whenever you get quite a long sequence, consider that it is two different runs of numbers, alternating, like here.
Good tip - thanks
surrogate mum
Posts: 3
Joined: Tue Sep 15, 2009 7:13 pm

Post by surrogate mum »

:D there are two sequences here.
sequence one :

11,-----, 12,-----,14,-------,17,( add 1, add2, add 3, add 4)
sequence two

-------, 19, ------, 17,-----,14,------, { ? ] (minus 2,minus 3, and than the answer minus 4)
hope that helps
Booklady
Posts: 522
Joined: Mon May 19, 2008 10:39 pm

Post by Booklady »

Thanks SG - It was really obvious when pointed out!! :oops:
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