Question

In an AP, if $d=-2,n=5$ and $a_n=0$, then the value of $a$ is

• A. $10$
• B. $5$
• C. $-8$
• D. $8$

Answer 1

The correct option is D $8$

Given:

$d=-2$

$n=5$

$a_n=0$

We know:

$a_n=a+(n-1)d$

$\therefore 0=a+(5-1)(-2)$

$\therefore a=8$

Hence, the value of $a$ is $8$.