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Question

If a hexagon is drawn on 6 elements of a pascal's triangle and those elements are 15, 20, 35, x, 56, 21, then find x.
  1. 50
  2. 60
  3. 40
  4. 70


Solution

The correct option is D 70
If a hexagon is drawn on a pascal's triangle, then the product of alternate elements is equal to the product of the other alternate elements.
So, 15×35×56=20×x×21x=15×35×5620×21=70

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