SOLUTION: The first and last term of the arithmetic progression are 3 and 21 respectively and the sum of the series is 240. Find the number of terms.
Algebra ->
Sequences-and-series
-> SOLUTION: The first and last term of the arithmetic progression are 3 and 21 respectively and the sum of the series is 240. Find the number of terms.
Log On
Question 818833: The first and last term of the arithmetic progression are 3 and 21 respectively and the sum of the series is 240. Find the number of terms. Answer by tommyt3rd(5050) (Show Source):
