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KVPY2014MathematicsSequences and Series

The population of cattle in a farm increases so that the difference between the population in year n +2 . If the populations in year 2010,2011 were 39,60 and 123, respectively, then the population in 2012 was

Options

  1. A81
  2. B84
  3. C87
  4. D90

Correct answer

B. 84

Step-by-step solution

array l array l year Population 2010-39 2011-60 2012-x 2013-123 According to Q x-39=k(60) & 63=k r x-39= 63 x .63 x²-39 x=-(60)(63)=0 x=84 &-40 array array

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