Question

if the nth term of an AP is (2n+1), then find the sum of its first 3 term
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Answer 1

Answer:

Step-by-step explanation:

If nth term of an A.P = 2n+1

then, first term of A.P = 2(1)+1

= 2+1

= 3

then, second term = 2 (2) + 1

》4+1

》5

third term = 2 (3) +1

》6+1

》7

sum of terms = 3+5+7

sum of terms = 15

Answer 2

Answer:

15

Step-by-step explanation:

We have to find first 3 terms first

Put n = 1, 2 and 3 turn by turn

2(1)+1 = 3

2(2)+1 = 5

2(3)+1 =7

So the sum of first 3 terms will be

3 +5+7 = 15