Question

the sum of first 10terms of an arithmetic progress is 200 and first term is 10.find the last term
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Answer 1

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Answer:

s10= 200  

a = 10

n= 10

sn = n/2( a +an)                (an is the last term)  

200= 5 (10 + an)               (sn is sum of terms)

200=50 + 5 an

200-50=5an

150=5an

an= 150/5

an=30

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