Question Text
Question 1 :
Find the sum of the first $15$ terms of the following sequence having $n$th term as<br>${ y }_{ n }=9-5n\quad $
Question 5 :
Is it an AP?<br/><br/>$1, 4, 7, 10, 13, 16, 19, 22, 25, ...$
Question 6 :
If $a, b, c$ are in A.P. then $\dfrac {a - b}{b - c}$ is equal to
Question 7 :
Find the number of terms in an A.P. : -1, -5, -9 .......... - 197
Question 8 :
The third term of  an arithmetic progression is $18$, and the seventh term is $30$, then the sum of $17$ terms is 
Question 9 :
Find the missing number in the arithmetic mean between $11$ and $100$.
Question 10 :
What is the first four terms of the A.P. whose first term is $-1$ and common difference is $0.5$?
