CBSE Class 11-science Answered
sequence and series
Asked by devendra.mittal | 23 Oct, 2009, 03:23: PM
Expert Answer
if a,b,c are in H.P then 1/a,1/b,1/c are in AP
So 2/b =(a+c)/ac or b = 2ac/(a+c) ...(i)
a/b+c,b/c+a,c/a+b will also be in HP
since (b+c)/a, (c+a)/b,(a+b)/c are in AP
2 (c+a)/b = (a+b)/c+(b+c)/a
Using value of b from (i) we get the LHS =RHS
hence (3) option is correct
Answered by | 30 Nov, 2009, 12:13: PM
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