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a tree height increases annually by 1/8th of its present height today its height is 64inch.what is the height of the tree after 2yrs?

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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 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.
the population of india increase by 25% annually if the present population is 1crore.then what is the difference between the population 3yrs ago and 2yrs ago