Let S be a subset of R5 which spans R5 Then S Must consist o
     Let S be a subset of R^5 which spans R^5. Then S.  Must consist of at least five vectors.  Must be a basis for R^5.  Must be linearly independent.  Must have at most five vectors.  Must have exactly five vectors. 
  
  Solution
answer is \" a \".
dimension of R5 is 5.so basis of R5 contains 5 vectors.now we knew that any spanning set of R5 must be reduced to a basis i.e basis contained in a spanning set.so spanning set must contain at least 5 vectors since basis has 5 vectors.

