MathematicsIn a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on. If there are 5   rose plants in the last row, then how many rows are there in the flower bed?

In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on. If there are 5   rose plants in the last row, then how many rows are there in the flower bed?


  1. A
    8
  2. B
    3
  3. C
    5
  4. D
    10 

    Fill Out the Form for Expert Academic Guidance!l



    +91



    Live ClassesBooksTest SeriesSelf Learning



    Verify OTP Code (required)

    I agree to the terms and conditions and privacy policy.

    Solution:

    Consider the given question,
    In a flower bed, there are 23 rose plants in the first row, 21 in the second, 19 in the third, and so on.
    Then, the A.P. is:
    23,21,19,...,5
    Thus,
    a=23 d=2123 d=2  
    Number of rows should be equal to the nth term.
    So,
    a n =a+ n1 d 5=23+ n1 2 9=n1 n=10  
    Therefore, there are 10 rows of rose plants.
    Hence, option 4 is correct.
     
    Chat on WhatsApp Call Infinity Learn

      Talk to our academic expert!



      +91


      Live ClassesBooksTest SeriesSelf Learning




      Verify OTP Code (required)

      I agree to the terms and conditions and privacy policy.