Question

The sum of first n term-14 and last term 4 common difference 2. Find n and a.

Answer 1

Answer:

Step-by-step explanation:

an= a+(n-1)d

4 = a+(n-1)2

4-a = (n-1)2

2 -a/2

Sn= n/2 (a+l)

14 = n/2 (a+4)

28

Answer 2

Hope it helps you...