. In an A. P: 25, 22,19,....4 find sum
Share
. In an A. P: 25, 22,19,....4 find sum
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
HOPE YOU HAVE GOT YOUR ANSWER
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