00:00The arithmetic mean of A and B is 6.
00:02The question asks what the harmonic mean of A and B is, given that their geometric mean is 12.
00:08Guys, the quickest way to do it is like this.
00:11The square of the geometric mean is also equal to...
00:15It is the arithmetic mean multiplied by the harmonic mean.
00:19What is our geometric mean? 12.
00:22The square of 12, that is, multiply 12 by itself.
00:24It's also equal to that.
00:25What was it, guys? The arithmetic mean was 6.
00:28The question was about the harmonic mean.
00:33Both sides are multiplication and division, and since there are two equalities, 1 and 2.
00:39The harmonic mean is found to be 24 here.
00:42Our answer is: get it.
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