1.If ∣c⃗∣2=60|\vec{c}|^2 = 60∣c∣2=60 and c⃗×(i^+2j^+5k^)=0⃗\vec{c} \times (\hat{i} + 2\hat{j} + 5\hat{k}) = \vec{0}c×(i^+2j^+5k^)=0, then a value of c⃗⋅(−7i^+2j^+3k^)\vec{c} \cdot (-7\hat{i} + 2\hat{j} + 3\hat{k})c⋅(−7i^+2j^+3k^) isa.424\sqrt{2}42b.121212c.242424d.12212\sqrt{2}122Login to continueOnly logged in users canattempt or see the solution.
