MCQ
The value of expression $\hat{i}, \hat{i}-\hat{j} \cdot \hat{j}+\hat{k} \cdot \hat{k}$ is $-$
- A$0$
- ✓$1$
- C$2$
- D$3$
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$I$. $f$ is continuous on the closed interval $[a, b]$
$II.$ $f$ is bounded on the open interval $(a, b)$
$III.$ If $a$ $< a_1< b_1< b$, and $f (a_1)<0< f (b_1)$, then there is $a$ number $c$ such that $a_1 < c < b_1$ and $f (c)=0$