Question

is which numbers are multiplied we will get the above answer 123456789987654321​

Answer 1

11 * 11 = 121

111 * 111 = 12321

what we observe is that the square of the number follows a pattern: 2 1's gives 121. 3 1's gives 12321.

so to get 12345678987654321 we need to get square of 9 1's(111,111,111).

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Answer 2

Answer is 111,111,111.

Solution is as follows actually it follows a sequence

1^2. = 1

11^2. = 121

111^2. = 12321

1111^2. = 1234321 ..

….

… So on Similarly

111,111,111^2 = 12345678987654321

So the number of 1’s is the middle digit …