



 
Hi Rachel, With multiple choice questions, if you don't see the correct choice immediately then try to eliminate some of the options. For example in this problem you have four terms of a sequence, 2, 5, 10 and 17 and hence $n = 1, 2, 3, \mbox{ and } 4.$ Look at option a.
Next try option b.
Now option c.
There is no need to go through the options in order as I did. For example you might have seen immediately that d. is not the correct option. When $n = 1$ the expression for d. gives $2n + 1 = 3$ and the first term of your sequence is 2. I hope this helps,  


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