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? Choose the correct choice from the following options:
A) 320 B) 720 C) 6480 D) 2160 E) 520
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   ANSWER:720
<result>B</result>
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?