Given `A=|a b 2c d e 2f l m 2n|,B=|f 2d e 2n 4l 2m c 2a b|` , then the value of `B//A` is ___________.

Answer

5

Explanation

`B =2xx2 |{:(f,,d,,e),(n,,l,,m),(c,,a,,b):}|`
`=2 |{:(2f,,d,,e),(2n,,l,,m),(2c,,a,,b):}|`
`=2|{:(2f,,a,,b),(2n,,d,,e),(2c,,l,,m):}|" "[R_(3) hArr R_(2) " and then "R_(2) hArr R_(2)]`
`=2 |{:(a,,b,,2c),(d,,e,,2f),(l,,m,,2n):}|" "[C_(1) hArr C_(2) " and then " C_(2) hArr C_(3)]`
`=2A`
`:. B//A =2`