Answer = 4/7 ( and I understand the solution )
Want to know what is wrong in my process:
BB: Barbara and Betsy
Total: 6 ( non - BB ) + 2 (BB)
total combination possible: 8C4 = 70
total combination including both BB : 2C2 * 6C2 = 15 ( These are combinations including both BB )
total combination with atleast one of BB : 70 -15 = 55
Required probability = 55 / 70
please help