Question

Please give me answer of 24

Answer 1

Answer:

Find an answer to your question sum of first 20 terms of an A.P is -240and its first term is 7. find its 24th term.

Rating

Answer 2

Answer:

S7=n/2{2a-(n-1)d

2100=7/2{2*20+(7-1)d}

600=40+6d

d=560/6

d=280/3

s31=31/2{2*20+30*280/3}

s31=31/2(40+2800)

s31=44020