A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). So $P(X_n | X_1, X_2, \ldots X_n-1) = P(X_n | X_{n-1})$.
Some people find molecules and compounds confusing. Here's how to remember the difference. If you join two different chemical elements together, you can often make a completely new substance. Glue two atoms of hydrogen to an atom of oxygen and you'll make a single molecule of water.
A molecule of water is made of the the elements Hydrogen and Oxygen-two atoms of Hydrogen combined with one atom of oxygen. Sugar (C12H22O11) is made up of 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.Many elements in particular the gases occur naturally as molecules e.g.olecules may be â¦ made up of atoms of the same element such as Hydrogen gas (H2 - two atoms of Hydrogen), or atoms of different elements such as Sodium Chloride (NaCl).