jianhong12
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arithmetic formula for sum of first n term = [math]\frac{n}{2} \lbrack 2a+(n-1)d \rbrack [/math]when a means first term is 660 and d means common difference is 660,Please follow our guidelines:
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What formula(s) do you know for arithmetic sequences/series? What happened when you tried using them?
Please take another look at the common difference.arithmetic formula for sum of first n term = [math]\frac{n}{2} \lbrack 2a+(n-1)d \rbrack [/math]when a means first term is 660 and d means common difference is 660,
[math]\frac{n}{2}\lbrack 2(660)+(n-1)(660) \rbrack = 70800[/math] ????