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A sequence x1 , x2 and x3 …
is said to be in a harmonic progression if the reciprocals 1/x1,1/x2
and 1/x3 are in arithmetic progression. The 5th term and the 7th term
17 10 680
21 18 1512
7 1 28
for an harmonic progression are 30 and 50 respectively. What is the
difference between the 6th and 4th term.
a. 16
b. 14.5
c. 13.4
d. 12.5.
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- its ans is 12.5
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