An arithmetic sequence is given as follow:-20,-15,-10....,175 Find the sum of the last 20 terms
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a=-20
d=5
s=20/2[2a+(n-1)d]
s=10[-40+(19)5]
s=10[-40+95]
s=10[55]
s=550.
hope it's helps
d=5
s=20/2[2a+(n-1)d]
s=10[-40+(19)5]
s=10[-40+95]
s=10[55]
s=550.
hope it's helps
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See the attachment for detail solution
Hope it will help you
Hope it will help you
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