Find the sum of the first 20 terms of the Arithmetic series 4+7+10+.....
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Answered by
1
Answer:
the correct answer is 1410
Attachments:
Answered by
1
Answer:
650
Step-by-step explanation:
a=4
n=20
d=3
therefore, Sn=n/2{2a+(n-1)d}
S20= 20/2{2×4+(20-1)×3}
=10{8+19×3}
=10{8+57}
=10{65}
=650
HOPE THIS WILL HELP ☺️
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