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Fantom [35]
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
Mathematics
1 answer:
Gwar [14]3 years ago
6 0
S3= 3/2 [2a1+(3-1)d]
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