Let a = {a │ a = 2x3y5z, x, y, Z, ∈ n} (2x is the x power of 2), and B = {B │ B ∈ a, 1 ≤ B ≤ 10}. Then, we find the sum of subsets containing elements 1 and 10 in set B Find the number of subsets. Please explain the reason

Let a = {a │ a = 2x3y5z, x, y, Z, ∈ n} (2x is the x power of 2), and B = {B │ B ∈ a, 1 ≤ B ≤ 10}. Then, we find the sum of subsets containing elements 1 and 10 in set B Find the number of subsets. Please explain the reason

According to the meaning of the problem, set B = {B │ B ∈ a, 1 ≤ B ≤ 10} = {1,2,3,5,6,10}
Then the subset containing elements 1 and 10 in B has 2 ^ 4-1 + 1 = 16