The value of
$$ 99^{50}-90 \cdot 98^{50}+\frac{99 \cdot 98}{1 \cdot 2}(97)^{50}-\ldots \ldots \ldots \ldots .+99 $$
is
5
1
3
0
A five digit number (having all different digits) is formed using the digits $1,2,3,4,5$, 6,78 and 9 . The probability that the formed number either begins or ends with an odd digit is equal to
$\frac{5}{6}$
$\frac{1}{3}$
$\frac{1}{6}$
$\frac{2}{3}$
The function, $f(x)=(3 x-7) x^{2 / 3}, x \in R$ is increasing for all $x$ lying in
$(-\infty, 0) \cup\left(\frac{3}{7}, \infty\right)$
$(-\infty, 0) \cup\left(\frac{14}{15}, \infty\right)$
$\left(-\infty, \frac{14}{15}\right)$
$\left(-\infty, \frac{14}{15}\right) \cup(0, \infty)$
Let $A=\left[\begin{array}{ll}x & 1 \\ 1 & 0\end{array}\right], x \in R$ and $A^4=\left[a_{i j}\right]$.
It $a_{11}=109$, then $a_{22}$ is equal to
21
10
9
14
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