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Grade: 11

                        

If a, b, c, d are four number such that first three are in AP and last three are in hp the1)bc=ad2)ac=bd3)ab=cd4lnone of this

3 years ago

Answers : (1)

Sakshi Agarwal
37 Points
							2b= a+c....(i)         c= 2bd/b+d.....(ii)       Substituting the value of b from equation (i) to (ii)     c =(2ad+2cd)/(a+c+2d)           ac+c²+2cd = 2ad + 2cd              ac+c² = 2ad       c(a+c) = 2ad              c (2b) = 2ad        bc=ad.      (Ans)
						
3 years ago
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