Posted by **patricia** on Wednesday, April 22, 2009 at 2:41pm.

find the rules and then complete the sequence

1,2,4,3,9,5,16,7,____,____

please show workings

- 11+ maths -
**Reiny**, Wednesday, April 22, 2009 at 2:56pm
if the second term has been a 1

I would see a nice pattern

the odd-numbered positions are simply the squares of the natural numbers.

i.e. the first, third, fifth, seventh ...terms are 1,4,9,16,..

then even-numbered positions are simply the odd numbers.

i.e. the second, fourth, 6th, 8th,.. terms are (1),3,5,7,...

if the second is indeed a 2 as you typed it, I see no pattern, that fits all the terms.

Once you get past the second term, the pattern I noted still applies.

- 11+ maths inverse operation -
**patricia**, Friday, April 24, 2009 at 8:07am
4a + 12 = 7a - 9

what is a ?

please show workings

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