I was trying to expand and i got 1 + 2 + 3 + 4.. + n. But the answer key shows 1 + 2 + 3...(n -2 ) + (n-1) +n. I don't understand why there are (n -2 ) and (n-1) in the series
I was trying to expandView attachment 28600 and i got 1 + 2 + 3 + 4.. + n. But the answer key shows 1 + 2 + 3...(n -2 ) + (n-1) +n. I don't understand why there are (n -2 ) and (n-1) in the series
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