Arun
Last Activity: 6 Years ago
Dear Geetesh
Total - {2Rs together + 2As together - RRAA all of them together}
.. beacuse both the cases where 2Rs/2As are together also include RRAA. We need to subtract those... Sort of Venn diagram problem
= 11!/(2!*2!*2!*2!) - {(2*10!/2!*2!2!) - 9!/2!*2! }
Regards
ARUN (askIITians forum expert)
