Find the 18th and nth terms of the A.P.16, 11, 6, 1,-4,...
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Answer:
a=16, d= 11-16=-5
T18= a+17d
=16+17 into - 5
=16 -85
=--69
Tn = a+(n-1)d
=16 + (n-1)-5
=16 - 5n+5
21-5n
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