title: Relationship between the number of test cases and the parameters + cardinality + order of combination (strength) in Pairwise test
body: <p>I am using the <a href="https://matris.sba-research.org/tools/cagen/#/generate" rel="nofollow noreferrer">ACTS</a> to generate Pairwise tests. For 4 parameters with cardinality of 5, 4, 4, 4 it generates 24 test cases for test strength of 2 (pairwise). For test strength of 3, it generates 115 test.</p>
  <p>How do I mathematically calculate the number of tests it will generate?</p>
  <p>Thanks.</p>