THE SUM OF ALL NUMBERS OF THE FORM 2K + 1, WHERE K TAKES ON INTEGR...
15. The sum of all numbers of the form 2K + 1, where K takes on integral values from 1 to n, is(A) n
2
(B) n(n + 1)(C) n(n + 2)(D) (n + 1)2
(E) (n + 1)(n + 2)