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If $¯ a$ and $¯ b$ are non-collinear unit vectors and $| ¯ a + ¯ b | = \sqrt{3}$ then $(2 ¯ a + 5 ¯ b) \cdot (3 ¯ a - ¯ b) = ?$
$\frac{15}{4}$
$15$
$16$
$\frac{15}{2}$

A

\frac{15}{4}

B

\frac{15}{2}

C

15

D

16

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Q1

If

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