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 oddnumbered positions are simply the squares of the natural numbers.
i.e. the first, third, fifth, seventh ...terms are 1,4,9,16,..
then evennumbered 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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