Question

7. In AP, an = 3 + 4n then sum of first two terms of AP
is​

Answer 1

Answer:Answer

3+4n

Putting value of n as 1

3+4×1=7

Now putting value of n as 2

3+4×2=11

So,ap=7,11,15,19.......

Sn=n/2{2a +n-1+×d}

S15=15/2{14 +14×4}

S15=15/2×70

S15=15×35

S15=525

Step-by-step explanation:

Answer 2

Answer:

answer for the given problem is given