Question

. In an A. P: 25, 22,19,....4 find sum​

Answer 1

HOPE YOU HAVE GOT YOUR ANSWER

Answer 2

Answer:

Here an=4 sn=? a=25,d= 22-25=-3

Step-by-step explanation:

USING the formula an= a+(n-1)d

4=25+(n-1)*-3

4=25-3n+3

3n=25+3-4

3n=24

n=24/3

n=8

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

Sn=8/2[25+(8-1)*-3]

Sn=4[25+7*-3]

Sn=4[25-21]

Sn=4*4

Sn=16