In an AP the 12th term exceeds the 5th term by 21 and the sum of the first 12 terms is 234

MATHEMATICS · Multi-part · A Level · Mathematics · Sequences and series · Sequences and series

Problem

In an AP the 12th term exceeds the 5th term by 21 and the sum of the first 12 terms is 234. Determine: (a) the first term, (b) the common difference.