Mathematics7 pillars are used to hold a slant iron gutter as shown in the figure. If the distance between every two pillars is 1m and height of the last pillar is 10.5m. Find the height of the first pillar.

7 pillars are used to hold a slant iron gutter as shown in the figure. If the distance between every two pillars is 1m and height of the last pillar is 10.5m. Find the height of the first pillar.


  1. A
    2 m
  2. B
    3.5 m
  3. C
    4.5 m
  4. D
    7 m 

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    Solution:

    Here d = 1 and an = 10.5
    an=a+(n-1)d
    a7=10.5=a+(7-1)1
    a=4.5
    Therefore, from above we see that the height of the first pillar is 4.5m.
    So, Option 3 is correct.
     
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