MCQ

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If $\vec r = 3\hat i+ 2\hat j +5\hat k\,\,,\vec a= 2\hat i-\hat j +\hat k,\,\,\vec b= \hat i+ 3\hat j -2\hat k$ and $\vec c =-2\hat i +\hat j -3\hat k$ such that $\vec r=\lambda \vec a+\mu \vec b+\gamma \vec c$, then -

• ✓
  $\mu,\frac{\lambda}{2},\gamma$ are in $A.P$
• B
  $2\mu,\lambda,\gamma$ are in $A.P$
• C
  $\mu,\lambda,\gamma$ are in $A.P$
• D
  $\lambda,\frac{\mu}{3},\gamma$ are in $A.P$