find 6th term from end of the A. P 17,14,11,....—40
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a=17
d=-3
t6=a+(n-1)d=-40
17+(n-1)-3=-40
17-3n+3=-40
-3n=-60
n=20
d=-3
t6=a+(n-1)d=-40
17+(n-1)-3=-40
17-3n+3=-40
-3n=-60
n=20
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