If a^(-1),b^(-1),c^(-1),d^(-1) are in A....

If `a^(-1),b^(-1),c^(-1),d^(-1)` are in A.P. then show that `b=(2ac)/(a+c)` and `b/d=(3a-c)/(a+c)`

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MODERN PUBLICATION-SEQUENCES AND SERIES-REVESION EXERCISE

The ages of the students of a class form an A.P. whose common differen...
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If a^(-1),b^(-1),c^(-1),d^(-1) are in A.P. then show that b=(2ac)/(a+c...
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If x,y,z are in G.P and a^x=b^y=c^z,then
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We are given two G.P's one with the first term a and common ratio r an...
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If S(n) denotes the sum of n terms of a G.P., prove that: (S(10)-S(20)...
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The sum of the first thre consecutive terms of G.P is 13 and the sum o...
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If 1/(a+b)+1/(b+c)=1/b, prove that a,b,c are in G.P.
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150 workers were engaged to finish a job in a certain number of days. ...
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If |x|<1a n d|y|<1, find the sum of infinity of the following series: ...
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A manufacture reckons that the value of a machine which costs him Rs. ...
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The sum of the series : 1+1/(1+2)+1/(1+2+3)+...... upto 10 terms is :
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Obtain the sum of the series 1/4+1/16+1/64……………….to oo
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