Question

Question 1 (ii)
Fill in the blanks in the following table, given that a is the first term, d the common difference and $a_n$ the $n^{th}$ term of the A.P.
$\begin{array}{ccccc}& a& d& n& a_n\\ \left(ii\right)& -18& \dots \dots & 10& 0\end{array}$

Answer 1

(ii) Given that,
$a=-18,n=10,a_n=0,d=$?
We know that,
$a_n=a+(n-1)d0=-18+(10-1)d18=9dd=\frac{18}{9}=2$
Hence, the common difference, d = 2.