IIT JEE , AIEEE Forum - Mathematics , Algebra

nadeemoidu

In the answer given by avinash.sharma, I dont understand why only 2! cases have been removed because B comes in the starting position .

Also cases like BABACBC have not been taken.
I have listed all the possible cases below.

BABCABC
BABCACB
BABCBAC
BABCBCA
BABACBC

Here exchange B and C and you get another 5 cases(except the B at the first position).

Again exchange A and C in all the 10 cases above and you get another 10 cases.
So the total is 20.

Let me know if I have missed any case.

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