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In a regular decagon, to find the number of diagonals, we use the formula n(n-3) divided by 2.
N is the number of sides.
In a decagon there are 10 sides.
10(10-3) divided by 2
= 100-30 divided by 2
= 70/2
=35.
There are 35 diagonals.
The probability of 2 diagonal being chosen is 33/35
The answer is (d) none of these
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