5. Which term of an A.P.16, 11, 6, 1,... is -54 ?
6. Find the middle term(s) of an A.P. 9, 15, 21, 27...183.
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Answer:
a=16 d= -5 an= -54
a+(n-1)d=an
16+(n-1)-5= -54
-5n+5= -54-16
-5n= -70-5
-5n= -75
n=15
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