Question

Q. No.
Which
is
of
true
the
for
following
the series ?

2+ 4+ 6+8.....+2n=?
A. (n+1)
B n(n+1)
C 4n.​,D. n(n+1)/2

Answer 1

sum of n even numbers is n(n+1)

sum of 2n even numbers is n(n+1)/2