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Ex: 8.7 | Q.No. 8 to 12 | Prove & Find Harmonic Mean Progression | Class 11th Mathematics In Hindi

4,169 views · Published 22 June 2018 · 33:33 · Indexed 25 September 2026

Channel: Vishwakarma Classes · 2018 · Education

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Exercise 8.7
Q. No. 8. If a, b, c are in H. P., then prove that 1/(b - a)  1/(b - c) = 1/a + 1/c = 2/b
Q. No. 9. Find H. M. of roots of quadratic equation ax^2 + bx + c = 0.
Q. No. 10. If pth term of any H. P. is q and qth term is p, then prove that (p + q)th term will be pq/(p + q).
Q. No. 11. if roots of equation a(b - c)x^2 + b(c - a)x + c(a - b) = 0 are same, then prove that a, b, c will be in H. P.
Q. No. 12. If a student, from his house goes to school at the speed of 8 km/h and returns with the speed of 6 km/h, then find its average speed where as distance between house and school is 6 km. Also verify the answer.

Class 11th maths
Chapter 1 https://www.youtube.com/playlist?list=PLI2rONGSOAjLYtZcUS0SrFJ6HyM-34rHa
chapter 8 https://www.youtube.com/playlist?list=PLI2rONGSOAjIpjUX7GtkNeXlmFhNuU9Lo
Chapter 9 https://www.youtube.com/playlist?list=PLI2rONGSOAjIx4VeRi-yQMXIcueAWb3bq
chapter 13 https://www.youtube.com/playlist?list=PLI2rONGSOAjIBdJaQGa3LbV3eN-8Z9LHw

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