Find the last two digits of LCM of 724 - 1, 724 + 1?

If numbers are co-prime to each other, then the LCM is equal to product of the numbers.

LCM = (7²⁴ - 1) × (7²⁴ + 1) = 7⁴⁸ - 1

∴ (a + b) × (a - b) = a² - b²

Unit digit of 7⁴⁸ = 7⁴ = 1

Then 1 - 1 = 0, so option 1 00 satisfy