How many combinations of 4 in ascending order 24680?

To find the number of combinations of 4 from the set {2, 4, 6, 8, 0}, we first arrange the numbers in ascending order: {0, 2, 4, 6, 8}. Since combinations are selected without regard to order, we can use the combination formula ( C(n, k) ) where ( n ) is the total number of items to choose from and ( k ) is the number of items to choose. Here, ( n = 5 ) and ( k = 4 ), so the number of combinations is ( C(5, 4) = 5 ). Thus, there are 5 combinations of 4 numbers in ascending order from the set.