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

(1) 901 (2) 861 (3) 820 (4) 780

my attempt:

for this to be true i know that sum of x and y coordinate should be 41 but i don't know how to proceed.

(1) 901 (2) 861 (3) 820 (4) 780

my attempt:

for this to be true i know that sum of x and y coordinate should be 41 but i don't know how to proceed.