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The number of points, having both co-or...

The number of points, having both co-ordinates as integers, that lie in the interior of triangle with vertices (0,0) , (0,41), and (41,0) is :

A

901

B

861

C

820

D

780

Text Solution

Verified by Experts

The correct Answer is:
D

So number of points `=1+2+3+..+39`
` (39xx40)/(2)`
`=780`
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