Doubt regarding last question. In the question it is asked to find sum of even numbers between 20 and 90.. In that case we need to find (20^2+22^2+......90^2 ) or (22^2+24^2+... 90^2)?? That is whether square of 20 is included in the answer ?
There is an error In the last question first we should take(1-90) and then (1-18) and the Answer will be 1980.
Last question total sumil ninnm 2-18 vare ulla even number sum minus cheitha pore. 2-20 vare ulla sum minus cheyyumbo kittunna answer sum of 22-90 alle