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how many quadrilaterals can be formed using the vertices of a polygon of 10 sides having i)2 sides in common with sides of polygon ii)3 sides in common with polygon............ plzzzzzzzzz show each and every step.....................

how many quadrilaterals can be formed using the vertices of a polygon of 10 sides having i)2 sides in common with sides of polygon ii)3 sides in common with polygon............       plzzzzzzzzz   show each and every  step.....................

Grade:Upto college level

1 Answers

Pramod J AskiitiansExpert-IIT-B
36 Points
10 years ago

Dear student,

polygon has 10 vertices

A quad has 4 vertices 

=> number of quads possible = 10C4

for 2 sides to be common,

number of non adjacent sides can be picked = 2*(7+6+5+4+3) = 50

number of quads possible with adjacent sides = 9*7 = 63

toal = 50+63 =113

i hope this explains your question !!!

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