Question

all write All even humbus between 287010 2280
2870,2282,2874,2876,2878,2880​

Answer 1

The sum of all even numbers between 21 and 51

i.e. 22+24+26+28+....+50

first term is 22

last term is 50

common difference is 2

number of terms =
2
50−22
​
+1=15

∴ Sum of the terms is =
2
15
​
(22+50)=15×(11+25)=15×36=540.