Question

find the Sñ of the following 1/15,1/12,1/10,...….……….…to 11 terms​

Answer 1

Answer:

1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

ANSWER

Sum of n terms of AP formula:

S

n

=

2

n

[2a+(n−1)d] ......(1)

Where

First term =a

Common difference=d

Number of terms=n

1/15,1/12,1/10,..... to 11 terms

a=1/15

d=(1/12)−(1/15)=1/60

Using (1)

S

11

=11/2[2(1/15)+(11−1)(1/60)]

=(11/2)×[(2/15)+(1/6)]

=33/20

Sum of 11 terms of this AP is 33/20.