how many 6 digit n0. can b formed frm digits 1 2 3 4 5 6 7 so that d digit shouldn't repeat and the second last digit is even
a) 6480
b) 320
c) 2160
d) 720

• SECOND LAST DIGIT CAN BE FILLED IN 3 WAYS....SO
  NO OF DIGITS....6*5*4*3*3*2=2160.
• 12 years agoHelpfull: Yes(23) No(4)
• The second last digit can be filled by only three numbers i.e 2,4and6 in 3p1 ways.Remaining 6 nos can be placed in 5 places in 6p5 ways,hence the ans =6p5 * 3p1=2160
• 12 years agoHelpfull: Yes(10) No(1)
• option c)2160
• 12 years agoHelpfull: Yes(3) No(1)
• 2160.
  solution
  
• 12 years agoHelpfull: Yes(1) No(1)
• 2160 is correct.....................
  
• 12 years agoHelpfull: Yes(0) No(1)
• SECOND LAST DIGIT CAN BE FILLED IN 3 WAYS....SO
  NO OF DIGITS....5*4*3*2*3*3=720
  this is correct.
• 12 years agoHelpfull: Yes(0) No(4)
• 720*3
  2*3*4*5*3*6
• 12 years agoHelpfull: Yes(0) No(0)