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If the n th term of an ap is 2n 1 then sum of its first 3 terms is?
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If the n th term of an ap is 2n 1 then sum of its first 3 terms is?
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If the n th term of an ap is 2n 1 then sum of its first 3 terms is?
Nth term of an AP =2n+1

then first term =2x1+1=3
third term =2x3+1=7

sum of first 3 terms= n/2(a+l) = 3/2 (3+7) =3 x 5 =15
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If the n th term of an ap is 2n 1 then sum of its first 3 terms is?
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