Q26. If a, b, c, and d are in a Harmonic Progression (H.P.), then the expression ab + bc + cd is equal to:Mathematics — NUST Mock By IBAGRADS 1 — Question 26 of 200A. 3adB. (a+b)(c+d)C. 3acD. 3bdPractice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →