Question

In an arthemathic sequence frist term is -2 last term is 100 and sum of all term is 882 .What is its common difference

Answer 1

Answer:

789

Step-by-step explanation:

Answer 2

Answer:

Answer

Given,

a

1

+a

20

=88

a.

a

2

+a

19

=(a

1

+d)+(a

20

−d)

=a

1

+a

20

=88

b.

a

10

+a

11

=a

1

+9d+a

20

−9d

42+a

11

=a

1

+a

20

∴a

11

=88−42=46

c.

d=a

11

−a

10

=46−42=4

d.

a

10

=a+9d

a=42−9(4)

∴a=6