Asked by Sarah
In an arithmetic progression (A.P) of 21 terms: the 21st term is 252.find:the sum of the first 16 terms
Answers
Answered by
oobleck
S16 = 16/2 (2a+15d)
knowing neither a nor d, that is hard to evaluate.
All we know is that
a+20d = 252
knowing neither a nor d, that is hard to evaluate.
All we know is that
a+20d = 252
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