Question

If the tenth term of an AP is 20 and 20th term is 10, then the 30th term is :

• A. 0
• B. 10
• C. 20
• D. 30

Answer 1

Answer:

A. 0

$x_{10}=20$

$x_{20}=10$

$d=-1$

$x_{30}=x_20+(30-20)d$

$x_{30}=10+(10)\times-1$

$x_{30}=0$