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Q 2454178954.     If a person arranges some balls in the form of a square then he is left with 40 balls. If he wants to increase the size of square by one unit on each side of the square he finds that he will fall short of 21 balls in completing the square. What is the actual number of balls he had with him?
IBPS-CLERK 2017 Mains
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)