what is the sum of first 80 odd natural no.
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Answered by
2
Answer:
No. of terms = 80
Therefore, Sum = Square of the no. of terms.
Which is , 80²= 6400
Ans. 6400
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Answered by
0
Step-by-step explanation:
Given: n=80
a=1 d=2
An=a+(n-1)d
A80=1+(80-1)2=1+79(2)=159.
Sn=n/2(a+an)
Sn=80/2(1+159)
=40(160)
=6400.
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