What is the missing term in the given pattern?

2 × 5 = 10

22 × 55 = 1210

222 × 555 = 123210

2222 × 5555 = 12343210

22222 × 55555 = ?

It can be seen in the given pattern that when the 'n' number of digits of 2 and 5 are multiplied, the leftmost digit of the result starts from 1 and goes up to n, while the rightmost digit starts from 0 and goes up to (n − 1).

In the expression, (22222 × 55555) the first five digits from the left will be 12345 and the last five digits will be 43210.

∴ 22222 × 55555 = 1234543210

Thus, the missing term in the given pattern is 1234543210.