from 4 officers and 8 jawans in how many ways can 6 be chosen to include exactly 1 officer?

• 4C1*8C5=224
• 10 years agoHelpfull: Yes(70) No(2)
• 4 OFFICER'S, 8 JAWAN'S,
  _ _ _ _ _ _
  O J J J J J
  So, OFFICER CAN BE CHOSEN BY C(4,1) WAYS AND JAWAN'S IN C(8,5).
  THERE TOTAL WAY OF SELECTION = 224,
• 10 years agoHelpfull: Yes(6) No(0)
• (8C5*4c1)+(8C4*4c2)+(8C3*4c3)+(8C2*4c4)=742 ways
• 10 years agoHelpfull: Yes(4) No(18)
• (4c1*8c5)/12c6=8/33
• 10 years agoHelpfull: Yes(2) No(12)
• 12c1+12c5 exactly one officer can b chosen in frm 12 mems
  
• 10 years agoHelpfull: Yes(1) No(7)
• (4C1 * 8C5)*6!/5! = 1344
• 10 years agoHelpfull: Yes(1) No(5)