veda has 6 coiumns in the name of a,b,c,d,e,f.he has to check that no two columns should have the same entry .she can check only 2 columns at a time how many times will she have to repeat the comparing process to compail the process for the whole file....?
a.7
b.8
c.15
d.10

• 5C2 ways. 5!/3!*2!=10 ways
• 9 years agoHelpfull: Yes(0) No(1)
• ans C.15
  ab,ac,ad,ae,af,bc,bd,be,bf,cd,ce,cf,de,df,ef
  this are all the combinations, count it is 15
  
• 9 years agoHelpfull: Yes(0) No(0)