WeBWorK using host: https://webwork-dev.aimath.org, format: simple, seed: 44, course: anonymous

How many subsets are there of cardinality 4?

(Note: you can enter “C(n,k)” for $\binom{n}{k}\text{.}$ )

How many subsets of cardinality 4 have $\{2,3,5\}$ as a subset?

How many subsets of cardinality 4 contain at least one odd number?

How many subsets of cardinality 4 contain exactly one even number?