Hello, I cannot recall my algebra. how does this go from n(n+1)/2 +(n+1) to n(n+1) + 2(n+1)/2 I'm missing a step in between. Can anyone show me? thank you.
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Hi there. Do you mean: ? If so, you can't change it to , as the first term is now different. You could however change it to , as you are just multiplying the second term by which equals . Hope this helps
it does, thank you
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