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