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Q.517 :  माना की 2² + 4² + 6² + ....+....+..... 40² = 11480, तो 1² + 2² + 3² ...........+..........+.....20² का मान क्या होगा?

(a) 2827
(b) 2870
(c) 2868
(d) 2869
View Answer
Answer :2870

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