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Question from JEE Mains

  1. May 7, 2014 #1
    1. The problem statement, all variables and given/known data

    Find k.

    2. Relevant equations

    If (10)9 + 2(11)1 (10)8 + 3(11)2 (10)7 + ....… + 10 (11)9 = k(10)9

    3. The attempt at a solution

    dividing both sides by 109,

    1 + {2(11)1}/(10)1} + {3(11)2}/(10)2} + .............. + {10(11)9}/(10)9} = k

    1(1.1)0 + 2(1.1)1 + 3(1.1)2 + ..... + 10(1.1)9

    ∑(from n=0 to n=9) (n+1)(1.1)n
     
  2. jcsd
  3. May 7, 2014 #2

    AGNuke

    User Avatar
    Gold Member

    It's an AGP. What's the problem?
     
  4. May 7, 2014 #3
    Last edited: May 7, 2014
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