There are 4 red chips and 2 blue ones. When arranged in a row, they form a certain color pattern, for example RBRRB. How many color patterns?  Choose the correct choice: A) A)10 B) B)12 C) C)24 D) D)50 E) E)100
Using anagram method:   6_5_4_3_2_1   R_R_R_R_B_B   so..   6!/Number of repeated letters (4!)(2!) = 5   ANS:50
<result>D</result>
There are 4 red chips and 2 blue ones. When arranged in a row, they form a certain color pattern, for example RBRRB. How many color patterns?