Question

given an=4,d=12,sn=-14 find n and a​

Answer 1

Step-by-step explanation:

let's try this...

given,

an=4. d=12. sn=-14

then,

n= 4/a

n=14/s

then,

4/a=14/s

2/a=7/s

a=2s/7.........1)

s=7a/2.......2)

Check whether the value of d is actually the 'd'.

because I don't see anywhere to fill the value of d..