The following two problems are baffling me to no end..... please help!

1) In a Geometrical Progression , prove that the product of any two terms, equidistant from the beginning and the end, is constant and is equal to the product of the first and last terms.

2) Prove that the product of the two middle terms of a Geometrical Progression, consisting of anevennumber of terms is equal to the product of the first and last terms.