Higher Math 1st Paper MCQ-Dhaka Board-2017

1. $\int \sin x^{\circ} d x=?$

2. $A=\left(\begin{array}{lll}3 & 0 & 0 \\ 0 & 4 & 0 \\ 0 & 0 & 5\end{array}\right)$ is a matrix.

$A$ is -

i. symmetric matrix

ii. scalar matrix iii. diagonal matrix Which one is correct?

3. What is the slope of the straight line which is perpendicular to $y=-7 x+9$

4. In permutation and combination-

i. ${ }^{n} \mathrm{C}_{\mathrm{r}}={ }^{n} \mathrm{C}_{\mathrm{n}-1}$

ii. ${ }^{n} C_{t}+{ }^{n} C_{t-1}={ }^{n+1} C_{t}$

iii. $r ! \times{ }^{n} C_{T}={ }^{n} P_{r}$

Which one is correct above the information?

5. If ${ }^{n} C_{10}={ }^{n} C_{6}$ then $n=$ ?