Question

in an ap if a= -5,1=21 and s = 200 then n is equal to
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Answer 1

Answer:

n=23.5

Step-by-step explanation:

GIVEN : a=(-5) l= 21 s=200

So, as we know that S= n/2(a+l)

NOW,by putting the given values in the above formula, we get,

200=n/2(-5+21)

200=n(17)/2

200×2/17=n

so,n = 400/17

n=23.5

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