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PLSSSSS HELP ME, Write a formula for the sum of the first three terms, a1+a2+a3, Your answer should only include variables a1 and d. btw, term 1=a1 common difference=d
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13 votes
13 votes
PLSSSSS HELP ME, Write a formula for the sum of the first three terms, a1+a2+a3, Your answer should only include variables a1 and d.

btw,
term 1=a1
common difference=d

User Danyolgiax
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1 Answer

23 votes
23 votes
S3= 3/2 [2a1+(3-1)d]
User Cromax
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