Question

Observe the following pattern and supply the missing number.
$11^2 = 121$
$101^2 = 10201$
$10101^2 = 102030201$
$1010101^2 = …$
$...^2= 10203040504030201$

Answer 1

By following the given pattern, we obtain
$1010101^2 = 1020304030201$
$101010101^2 = 10203040504030201$