arithmetic sequence

find the sum of the first 30 terms of the arithmetic sequence 6,11,16,21......
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6+11+16+...30 terms

sum=2,355

start=6, last=151, start+last=157, averaej=78.5

sum=n*averaej=30*78.5
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Determine the number of terms in the given sequence -20, -25, -30, -35, ... , -205.
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