Question

X-2,4x,7x+2 Find the 12th term

Answer 1

Answer:

Soooory Dear I can't understand your question......

❤️ ❤️ Sweety ❤️ ❤️

Answer 2

An arithmetic sequence has a common difference.

∴

d

=

4

x

−

(

x

−

2

)

=

3

x

+

2

The sum of the first n terms of an arithmetic series can be given by

S

n

=

n

2

(

2

a

+

(

n

−

1

)

d

)

where  

a

is the first term.

∴

S

12

=

12

2

(

2

(

x

−

2

)

+

11

(

3

x

+

2

)

)

=

6

(

2

x

−

4

+

33

x

+

22

)

=

6

(

35

x

+

18

)

=

210

x

+

108

                         -Jai