Question

find the sum of first 14 terms of the sequence -3,3,9,15.......​

Answer 1

Answer:

use this formula it will help you

Step-by-step explanation:

try your self

Answer 2

Answer:

504

Step-by-step explanation:

Sn=n/2[2a+(n-1)d]

Sn=14/2[2×(-3)+13×6]

Sn=7×72

Sn=504