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प्रश्न
The number of diagonals in a polygon of n sides is equal to
विकल्प
nC2
nC2 – 2
nC2 – n
nC2 – 1
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उत्तर
nC2 – n
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Choose the correct alternative:
In 2nC3 : nC3 = 11 : 1 then
