ind the sum of n terms of :- 1/2*5+1/5*8+1/8*11+........

 

Let Sn be the sum of n terms of this series.

Note: Put the values of n to get the sum of n terms.

  • -5

1/2*5+1/5*8+1/8*11…

3/3(2*5)+3/3(5*8)+3/3(8*11)….

1/3[ (5-2)/5*2+(8-5)/5*8…..]

1/3[ 1/2 -1/5 + 1/5 – 1/8 +…..]

1/3 [ 1/2 ]

1/6…ans

  • -15
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