CUET · MATHS · PYQ PAPER 2023
If \(|\vec{a}|=7\) then \(|3 \vec{a}|\) is:
- A 63
- B 21
- C 7
- D \(\sqrt{21}\)
Answer & Solution
Correct Answer
(B) 21
Step-by-step Solution
Detailed explanation
\( |3 \vec{a}| = 3 |\vec{a}| \) \( = 3 \times 7 \) \( = 21 \)
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