The sum of 20 term of an ap 1,4,7,10,....is
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Answer:
Why is it said that the "knowledge is nothing without the presence of mind?"
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3
Step-by-step explanation:
a=1
d=3
Sn=n/2[a+(n-1)d]
=20/2[1+(20-1)3]
=10[1+19×3]
=10×58
=580
the sum of 20terms is 580
hope it help ☺☺
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