The sum of the first n natural numbers is a perfect square . The smallest value of n is ?
A5
B6
C7
D8
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1356, 1868, 2764 എന്നീ സംഖ്യ കളെ ഹരിക്കുമ്പോൾ 12 ശിഷ്ടം വരുന്ന ഏറ്റവും വലിയ സംഖ്യയേത് ?