The vectors 2j^+k^ and 3i^-j^+4k^ represent the two sides AB and AC respectively of a ∆ABC. The length of the median through A is (a) 342 (b) 48 (c) 18 (d) 432

The vectors 2j^+k^ and 3i^-j^+4k^ represent the two sides AB and AC re

1.	The vectors 2j^+k^ and 3i^-j^+4k^ represent the two sides AB and AC respectively of a ∆ABC. The length of the median through A is (a) 342 (b) 48 (c) 18 (d) 432
Answer» The vectors $2 \hat{j} + \hat{k} and 3 \hat{i} - \hat{j} + 4 \hat{k}$ represent the two sides AB and AC respectively of a ∆ABC. The length of the median through A is $(a) \frac{\sqrt{34}}{2} (b) \sqrt{48} (c) \sqrt{18} (d) \sqrt{\frac{43}{2}}$