Question

solve it ............​

Answer 1

Answer:

Step-by-step explanation:

2 sq = 4 . 3sq = 9  

4sq = 16 . 5sq = 25

6sq = 36. 7sq = 49

8sq = 64 9sq = 81

10sq = 100 . 11sq = 121

12sq = 144 . 13 sq = 169

14sq = 196  15sq = 225

16sq = 256. 17 sq = 289. 18 sq = 324

19sq = 361. 20sq = 400

adding all this we get 2869

or we can use the formula n²+(n+1*2-1)....