find the 17th and rth term of the series 12,9,3,....
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Step-by-step explanation:
a=12
d=9-12=-3
rth term = a -(r-1)d
=17 - (r-1)3
=17 - 3r +3
=20 - 3r
17th term = 20 - 3×17
=20-51
=-31
Hope it helps.
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