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3 years ago

14

PLSSSSS HELP ME, Write a formula for the sum of the first three terms, a1+a2+a3, Your answer should only include variables a1 an

d d.
btw,
term 1=a1
common difference=d

1 answer:

Gwar [14]3 years ago

6 0

S3= 3/2 [2a1+(3-1)d]

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