The first three terms of an A.P. are p-5,p-3 and 2p-15.If the sum of the first n terms of the progression is 180,find the value of n.

Answer:n=10

2 answers

well, now you know that

d = p-3 - (p-5) = 2
2p-15 - (p-3) = 2, so p=14
so, a = p-5 = 9

n/2 (2*9 + (n-1)*2) = 180
n = 10
Ohh..thank u ^^
Similar Questions
  1. Identify the terms as like or unlike terms.10xy, −15xy 10 𝑥 𝑦 , − 15 𝑥 𝑦 (1 point) Responses The terms are like
    1. answers icon 1 answer
  2. Identify the terms as like or unlike terms.10xy, −15xy (1 point) Responses The terms are like terms. The terms are like terms.
    1. answers icon 1 answer
    1. answers icon 1 answer
  3. Use the table to answer the question.Terms 1 10 20 Terms 2 20 40 Terms 3 30 60 Terms 4 40 80 Divide to prove each ratio is
    1. answers icon 3 answers
more similar questions