Question

find the sum of even numbers between 10 to 100​

Answer 1

Answer:

(when 10 and 100 are not included)

a=12

an=98

d=2

an=a+(n-1)d

98=12+(n-1)2

43=n-1

n=44

S44=44/2(12+98)

=22×110

=2420

The sum is 2420