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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Progressions-solve it if u can-
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[Post New]5 Apr 2008 22:11:16 IST
    Subject: Progressions-solve it if u can-
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blackjack (12)

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if S1,S2,S3 denote the sums of n terms of three A.P.'s whose first terms are unity and common differences in H.P.,prove that-
                n=(2S3S1-S1S2-S2S3)/(S1-2S2-S3)
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>


<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>

    
[Post New]5 Apr 2008 22:34:44 IST
    Subject: Progressions-solve it if u can-
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blackjack (12)

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no one???..........try!!!...........
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>


<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>

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[Post New]5 Apr 2008 22:42:41 IST
    Subject: Progressions-solve it if u can-
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ashish_banga (973)

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S1= n/2 (2 + (n-1) d1 )
similarly others
we can write d for 3 equations like
d1 = ( 2S1 -2n) / n(n-1) .. from above equation
similarly d2 and d3
now use d2 = 2 d1* d3 / d1 + d3 (they are in H.P. )
sove to get answer
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[Post New]5 Apr 2008 22:56:31 IST
    Subject: Progressions-solve it if u can-
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blackjack (12)

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thanks dude......got it...........
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>


<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>

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