Asked by RAFI

THE 16 TERM OF AN AP IS 35 AND 13 TERM IS 77 FIND THE SUM OF THE FIRST 20 TERM
Answered by RAFI
NO
Answered by oobleck
d = (35-77)/(16-13)
a = 77-12d
S20 = 20/2 (2a+19d)
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