Find the number of distinguishable permutations of: 2 Bs, 3 Hs, and 6 Os
(B, B, H, H, H, O, O, O, O, O, O)

If you could explain how / the formula, that would be great

Describe a pattern in each sequence what are the next two terms of each sequence -5, 5, -5, 5 a. subtract 10 from the previous term; -5,5 b. multiply the previous term by 1; 5, 5 c. add 10 to the previous term; -5, -15 d. multiply the previous term by -1; -5, 5