How many 6-digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 and 7 so that the digits should not repeat and the second last digit is even?
A. 320 [TICT, DCRU]
B. 720
C. 6480
D. 2160

• B.720
  let last digit is 2
  when second last digit is 4 remaining 4 digits can be filled in 120 ways,similarly is second last digit is 6 remaind 4 digits can be filled in 120 ways,
  so for last digit=2,total numbers=240
  last digit=4,tot no=240
  and last =6,tot no=240
  so total of 720 even numbers are possible
  
• 8 years agoHelpfull: Yes(0) No(0)