1.

0= 917 कक,१ (0.९1. 4em g the AP B 15 15 :W&"~°’M teom Pt & 4

Answer»

21,18,15.. a=21d=18-21=-3

81=a+(n-1)d81=21+(n-1)(-3)60=(-3)(n-1)-20+1=nn=-19

81 is not the term of AP

0=21+(n-1)(-3)-21=(n-1)(-3)7+1=nn=8



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