find the 19th term 805 786 767Solutiona 805 a1 786 80519
find the 19th term $805, $786, $767,...
Solution
a = 805
a1 = 786 = 805-19
a2 = 767 = 786-19
So, the common formula\' = An = Ao +(n-1)d, where An =nth term, A=first term, and n = nth term number, d =commondiff= -19
A19 = 805- (19-1)19 = 463
A19 = 463
