The sum of first 45 natural numbers is
Pick: A) 1035 B) 1280 C) 2070 D) 2140 E) None
Solution   We know that(1+2+3+.....+45)	= n(n+1)/2   Therefore (1+2+3+....+45)	=(45×46 / 2)   = 1035.   1035nswer 1035
<result>A</result>
The sum of first 45 natural numbers is