Answers

2016-07-09T17:48:16+08:00
N= nth term (50)
a=first term (2)
d= difference (e.g. 2,4,6...)
S= total sum

S = (n/2)(2a + (n - 1)d)
= (50/2)(2*2 + (50-1)2)
= 25(4 + 49*2)
= 25(4 + 98)
= 25(102)
= 2550
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