The numbers `h_1, h_2, h_3, h_4,..., h_10` are in harmonicprogression – InterviewSolution

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1.	The numbers `h_1, h_2, h_3, h_4,..., h_10` are in harmonicprogression and `a_1, a_2, ..., a_10` are in arithmetic progression. If `a_1 = h_1=3 and a_7=h_7=39`, thenthe value of `a_4 xx h_4` isA. `(13)/(49)`B. `(182)/(3)`C. `(7)/(13)`D. `117`
Answer» Correct Answer - D (i) In `AP, t_n = a + (n-1)d` and in HP, `t_n = (1)/(a+(n-1)d)`. (ii) Find the values of a and d by using the data.

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