Question

If pth, qth, rth term of am A. P are a, b, c respectively. Find the value of
(a-b) *r +(b-c) *p + (c-a) *q

Answer 1

Which term of the sequence
20, 19 1/4 , 18 1/2 , 17 3/4.... is the first negative term... Answer with solution, plz be fast.....