Given that the 7th term of an arithmetic progression (A.P.) is 31 and the sum of the…
MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series
Problem
Given that the 7th term of an arithmetic progression (A.P.) is 31 and the sum of the first seven terms is 133,
(i) Find the first term and the common difference of the A.P.
(ii) Calculate the 25th term.
(iii) Determine the sum of the first 25 terms.