Question

In an arithmetic sequence sum of first n terms, Sn=

n

2

(x1+xn)

Complete the following

Arithmetic

Sequence

First

term x1(f)

Common

difference (d)

n

th term Sum,Sn= n

2

(x1+xn)

3,6,9,...... 3 3 X20=60

S20 =

20

2

(x1+x20)= (3+60) =10 x 63=630

4,6,8,....... 4 2 X30 = 62 S30=

30

2

(4+62)=15x66 =990

7,11,15,..... 7 4 X25= ? S25=

25

2

(7+103)=12.5x110=1375

8,15,22,..... . . . . . . X40 S40 = . . .

9,18,27,..... . . . . . . X50 S50 = . . .

10,15,20,..... . . . . . . X75 S75 = . . .

6,12,18,....... . . . . . . X60 S60 = . . ​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

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