find 'n' if Sn is the sum of all odd numbers from 1 to 150
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3,5,7,9,11,13,15,17,1,21,23,25,27,29,31,33,35,37,39,41,43,4547,49,51... odd no. don't comes in the table of 2 so I can easy find them and the last digit of any no. is always2,4,6,8,0 so u can easily find even no and the remaining are odd
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