Question

how many numbers lie between 20² and 21²?​

Answer 1

Answer:

now we have to do as 20-n and 21 =n+1

Step-by-step explanation:

now

n,n+1=2n

now n =20

2×20

40 numbers lie between 20² and 21²

Answer 2

Answer:

40 it is easy brother lol