AA—- -AA— –AA– —AA- —-AA A’S should be together and there are 5 possible ways and remaining 4 should be placed in 4!ways 5*4!=120 Reply
120 (5×4!)
AA—-
-AA—
–AA–
—AA-
—-AA
A’S should be together and there are 5 possible ways
and remaining 4 should be placed in 4!ways
5*4!=120