a = i + j + k, a x b = j - k and a.b given: find b

1. A.
   $\hat{i}-\hat{j}+\hat{k}$
2. B.
   $2\hat{j}-\hat{k}$
3. C.
   $\hat{i}$
4. D.
   $2\hat{i}$

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1. A.
   $\frac{5}{3}\hat{i}+\frac{2}{3}\hat{j}+\frac{2}{3}\hat{k}$
2. B.
   $-\frac{5}{3}\hat{i}+\frac{2}{3}\hat{j}+\frac{2}{3}\hat{k}$
3. C.
   $\frac{5}{3}\hat{i}-\frac{2}{3}\hat{j}+\frac{2}{3}\hat{k}$
4. D.
   $-\frac{5}{3}\hat{i}+\frac{2}{3}\hat{j}+\frac{1}{3}\hat{k}$

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1. A.
   $\ \frac{5}{3}\widehat{i} + \frac{2}{3}\widehat{j} + \frac{2}{3}\widehat{k}$
2. B.
   $\widehat{i} - 2\widehat{j} + 4\widehat{k}$
3. C.
   $\widehat{i} + 2\widehat{k}$
4. D.
   $\ 2\widehat{i} - 3\widehat{j} + 4\widehat{k}$

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