11 + 12 + 13 + ... 51 + 52 = ?
Choose the correct choice from the following:	A) 1361	B) 1362	C) 1323	D) 1364	E) 1365
Sum = 11 + 12 + 13 + ... 50 + 51 + 52   Sum of n consecutive positive integers starting from 1 is given as n(n+1)/2   Sum of first 52 positive integers = 52*53/2   Sum of first 10 positive integers = 10*11/2   Sum = 11 + 12 + 13 + 14 + ... 51 + 52 = 52*53/2 - 10*11/2= 
<gadget id="calculator">52*53/2 - 10*11/2</gadget>
<output>1_323</output>
1323   Answer : 1323
<result>C</result>
11 + 12 + 13 + ... 51 + 52 = ?