An arithmetic sequence has a common difference of d. If the sum of 20 terms is 25 times the first term, find, in terms of d, the sum of 30 terms.
Follow Math Help Forum on Facebook and Google+
Originally Posted by amanda.chonghalliday An arithmetic sequence has a common difference of d. If the sum of 20 terms is 25 times the first term, find, in terms of d, the sum of 30 terms. where a is the first term n is the number of terms d is the common difference
View Tag Cloud