Question

Sum of 10 A.Ms Between 3 and 10 Is

please Explain Step By Step ​

Answer 1

Answer:

Correct option is

A

18

Let , A

1

,A

2

,A

3

be the three A.M.'s between 2 and 10

such that 2,A

1

,A

2

,A

3

,10 are in A.P.

a

n

=1+(n−1)d

n=3+2=5,a=2

∴10=2+(5−1)d

∴4d=8

∴d=2

A

1

=a+d=2+2=4

A

2

=a+2d=2+4=6

A

3

=a+3d=2+6=8

∴ Sum of 4+6+8=18