1) The unit's digit in the product (3127)173 is : A) 1 B) 3 C) 7 D) 9 Answer: Option CExplanation:Unit digit in (3127)173 = Unit digit in (7)173. Now, 74 gives unit digit 1. (7)173= (74)43 * 71. Thus, (7)173 gives unit digit 7.