natashagarlick natashagarlick

22-10-2020
Mathematics

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In an arithmetic sequence, the first term is -8 and the sun of the first 20 term is 790. Find the common difference

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anjumunnisa78 anjumunnisa78

22-10-2020

Answer:

a=-8,s20=790

Step-by-step explanation:

s20=10[-16+19xd]

790/10=-16+19d

79+16=19d

85=19d

d=85/19=5

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