Question

if an ap a=2, nth term =23,sum of ap is 400 the value of n​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

a=2

an=2+(n-1)d=23

(n-1)d=21......(1)

sm=n/2(2a+(n-1)d)=400

(2a+(n-1)d)=800/n

2a+21=800/n by putting 1

2.2+21=800/n

25=800/n

n=800/25

n=32