Question Text
Question 1 :
In an Arithmetic sequence, $S_{n}$ represents the sum to $n$ terms, what is $S_{n} - S_{n - 1}$?
Question 2 :
If $a, b, c$ are in A.P. $b - a, c - b$ and $a$ in G.P., then $a:b:c$ is
Question 4 :
The $4^{th}$ term of an AP is $14$ and its $12^{th}$ term is $70$. What is its first term? 
Question 5 :
If a, b, c and d are in harmonic progression, then $\displaystyle\frac{1}{a}$,$\displaystyle\frac{1}{b}$,$\displaystyle\frac{1}{c}$ and$\displaystyle\frac{1}{d}$, are in ______ progression.
Question 6 :
Find the function for the arithmetic sequence $11, 22, 33, 44...$.<br/>
Question 8 :
Is $51$ a term of the AP, $5, 8, 11, 14,........?$
Question 10 :
$\quad \left( 1-\cfrac { 1 }{ n } \right) +\left( 1-\cfrac { 2 }{ n } \right) +\left( 1-\cfrac { 3 }{ n } \right) +....upto\quad n\quad terms=$?
