Hi



  



    (8-2d) + 16d = 48

         14d = 40

           d = 40/14 = 20/7  and 



 

    

Answer by rahulsoni001002(1)   (Show Source): You can put this solution on YOUR website!
 T3=-8, T17=48 and T20=?



Tn=a+(n-1)d

T3=a+(3-1)d

-8=a+2d......(1)



Tn=a+(n-1)d

T17=a+(17-1)d

48=a+16d.....(2)



subtracting (2) from (1)

48=a+16d

-8=a+ 2d

-  -  - 

____________

56=  14d

d=4



-8=a+2d  putting d=4

-8=a+2(4)

-8=a+8

a=8+8

a=16



now a=16, d=4 ,T20=?

Tn=a+(n-1)d

T20=16+(20-1)(4)

   =16+(19)(4)

   =16+76

   =92

T20=92 

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