This video contains solution of ex 6.9 of unit 6 which is about sequences and series and this exercise is about harmonic sequences or progressions and harmonic mean. This video is for the students of fsc part 1 of punjab colleges and boards and this video contains exercise 6.9 of chapter 6 which is sequences and series. 0:00 Concepts 4:55 Question 1 8:01 Question 2 13:38 Question 3 15:03 Question 4 16:31 Question 5 17:54 Question 6 22:17 Question 7 25:41 Question 8 28:40 Question 9 31:36 Question 10 33:42 Question 11 38:16 Question 12 42:01 Question 13 45:47 Question 14 48:09 Question 15 51:04 Question 16 54:40 Question 17 56:35 Question 18 #11thmath #11thmath #firstyearmath #11thmaths