Question

sove the question given above​

Answer 1

Step-by-step explanation:

gjuffhgiven yuuiugfyu

Answer 2

Answer:

a=1,d=1, an = 400

an =a+ (n -1)d

400 = 1 + (n-1)1

400= 1 + n- 1

n= 400

Sn=n( an + a)/2

=400(400+1) /2

= 200 × 401

= 80200(Ans)

Step-by-step explanation:

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