Square Roots

If you do not understand the relation, this is a very difficult question. However, the value lies within the pattern of \( 11^2 \): \[ 11 * 11 = 121 \] \[ 111 * 111 = 12321 \] \[ 1111 * 1111 = 1234321 \] And so forth. The number of 1s in each multiple is equal to the highest number in the product. Therefore, the square root of 12345678987654321 is 111,111,111.