Calculate the sum of first 28 natural numbers. Select the correct option.
A) 426
B) 406
C) 401
D) 409
E) 405
Solution   We know that(1+2+3+.....+28)	= n(n+1)/2   Therefore (1+2+3+....+28)	=(28×29 / 2)   = 406.   Answer 406
<result>B</result>
Calculate the sum of first 28 natural numbers.