Please refresh or try again later the question urgently Share with your friends Share 0 Saloni Gautam answered this Dear student, Here is the solution of your asked query: Since a,b and 3c are in A.P. so we have;b-a=3c-b⇒2b=a+3c ...(i)Also, a,b and 4c are in G.P. so we have;ba=4cb⇒b2=4ac⇒c=b24a ...(ii)substituting the value of c in (i) we get;2b=a+3×b24a⇒8ab=4a2+3b2⇒4a2-8ab+3b2=0⇒4a2-2ab-6ab+3b2=0⇒2a2a-b-3b2a-b=0⇒2a-3b=0 and 2a-b=0⇒2a=3b and 2a=bSo ab=32 or 12 Regards 0 View Full Answer