... 'a' increases by two, and secondly that 'c' is b+1 on both of the terms. As I currently only have two numbers in the sequence for 'a', my assumption about 'a' increasing by two each time is not necessarily correct, because the sequence's 1st difference could go up by two instead of the difference staying the same each time. To check that my prediction is correct, I must come up with a formula to find 'b' from 'a', and therefore be able to find 'c'. Because I think 'c' is always 1 more than 'b' when 'a' is an odd number. I can write in an equation that 'c' is 1 more than 'b': c = b+1. Now I must test my prediction by using this formula, so I will substitute the number 5 for 'a'. b = 52 -1 2 b= 12 If my prediction that 'a' goes up by 2 ...

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