JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

Let $a = 3 \hat{i} + 2 \hat{j} + x \hat{k} an d b = \hat{i} + \hat{k},$ for some realx. Then $a \times b$ = r is possible if :

A
$3 \frac{3}{2} < r < 5 \frac{3}{2}$
B
$\frac{3}{2} < r \leq 3 \frac{3}{2}$
C
$0 < r \leq \frac{3}{2}$
D
$r \geq 5 \frac{3}{2}$

Solution

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