In a certain series, each term is m greater than the previous term. If the 22nd term is 560 and the 19th term is 500, what is the first term? Choose the correct option:
A) 220  B) 240  C) 260  D) 290  E) 305
a + 21m = 560 (22th term)   a + 18m = 500 (19th term)   You get a = 140 and m = 20   Answer :260
<result>C</result>
In a certain series, each term is m greater than the previous term. If the 22nd term is 560 and the 19th term is 500, what is the first term?