Question

If 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 = p/q and the HCF of (p,q) = 1, then find p× q = ?

Answer 1

Answer:

1625 x 820 + (- 625 ) x 820