Four numbers are inserted between two positive numbers so that the six numbers in all…
MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series
Problem
Four numbers are inserted between two positive numbers so that the six numbers in all form a geometric progression. If the first inserted number is 12 and the sum of the four inserted numbers is 480, what is the fourth inserted number?
(a) 108
(b) 192
(c) 324
(d) 96