Find the sum of at 2+5+8., to 20 terms using formulas
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Find the sum of at 2+5+8., to 20 terms using formulas
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Answer:
In the given A.P.
First trem,a=2
Common difference,d=5-2
=3
Sn=n/2[2a+(n-1)d]
S20=20/2[2×2+(20-1)3]
=10[4+19×3]
=10(4+57)
=10×61
=610.
Here is your answer.
by using the formula you will get 610 as your answer