Others Maths Puzzle

Find the infinite sum of the series 1/1 + 1/3 + 1/6 + 1/10 + 1/15...

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Others Other Question

7^187/800
What will be remainder?
Can Someone help with this Quadrilateral ABCD is a square. The points A(3,5) and C(10,8) are the end points of a diagonal AC of a square ABCD. Find the coordinates of the other vertices of ABCD

(3,10) and (8,5)
(5,3) and (8,10)
(8,3) and (5,10)