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Number Sequences - Help!
Posted: Fri Dec 21, 2007 8:33 pm
by correll
Amid the preparations for Christmas I am getting my daughter ready for her exam in Kent in January. We are hitting problems with the number sequence questions along the lines:
7 _ 9 16 11 24 _
and
4 12 11 33 32 96 _
I have tried common sequences, using an nth term approach but can't seem to crack them
Can anyone shed some light?
Posted: Fri Dec 21, 2007 8:48 pm
by Nou
First one looks to me like 2 separate sequences mixed together:
i.e.
7, 9, 11, 13 & 8, 16, 24
so the missing ones are 8 & 13
line 2 looks like pairs with the first number being multiplied by 3
i.e.
4 x 3 = 12
11x3 = 33
32x3=96
Hope this helps!
Posted: Fri Dec 21, 2007 9:10 pm
by Mike
Hi
The second sequence follows the rules
x3 then subtract 1
x3 then subtract 1
x3 the subtract 1
So the next number in the sequence is 95
Posted: Fri Dec 21, 2007 9:34 pm
by Nou
Sorry forgot to type that bit!
The Light Dawns
Posted: Sun Dec 30, 2007 4:10 pm
by correll
Thank you - this helps alot I was guilty of looking for more obvious sequences and just have to say how grateful I am not to be sitting the exam.