List of top Mathematics Questions on Sequences and Series asked in LPUNEST

A train travels $120 \text{ km}$ in $2 \text{ hours}$. What is its speed?
If \((x-2)\) is a common factor of the expressions \(x^2 + ax + b\) and \(x^2 + cx + d\), then \(\dfrac{b-d}{\,c-a\,}\) is equal to:
The elements of the set \(\{x : x \text{ is an integer},\; x^2 \le 4\}\) can be represented as \(\ldots Z \ldots\). Here, \(Z\) refers to:
If \[ \sum_{r=1}^{n} a_r = \frac{n(n+1)(n+2)}{6}\quad \forall\, n \ge 1, \] then \[ \lim_{n\to\infty}\sum_{r=1}^{n}\frac{1}{a_r} = \]
If 8 G.M.’s inserted between 2 and 3 then product of all 8 G.M.’s is
If one root of the quadratic equation $ax^2+bx+c=0$ is $3-4i$, then $31a+b+c=$