Suppose you have a bag of colored elastic bands and you choose one without looking. The probability the elastic band you choose
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Actually, you have to find four missed terms of geometrical sequence. Denote
and r - ratio, then
.
Since , you have that
, then
.
Now substitude r=2 in each of unknown 4 terms:
.
Answer: four geometric means between 25 and 800 are 50, 100, 200, 400.