determine the ap whose fifth term is 19 and difference of 18th term and 13th term is 20.
Share
determine the ap whose fifth term is 19 and difference of 18th term and 13th term is 20.
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.
According to the Question
a + 4d = 19 …. (1)
(a + 12d) - (a + 7d) = 20
5d = 20
d = 4
Put value of d in (1) we get
a + 4(4) = 19
a = 19 - 16
a = 3
Therefore AP are 3, 7, 11, 15