Question

mean of frist 10 even natural number is a 110 b 100 c 11 d 10

Answer 1

a=2 , d=2.
sum of first 10 even natural numbers=
n/2{2a+(n-1)*d}
=10/2{2*2+(10-1)*2}
=110
so,
mean=110/10
=11
answer = 11