what is the unit digit in the product (3^68 x 6^59 x 7^71) ?	Choose the correct answer: A) 1 B) 2 C) 4 D) 6 E) None of them
Unit digit in 3^4=1=&gt;Unit digit in (3^4)^16=1   therefore, Unit digit in 3^65=Unit digit in [(3^4)^16x3]=(1x3)=3   Unit digit in 6^59=6   Unit digit in 7^4=1=&gt;Unit digit in (7^4)^17 is 1   Unit digit in 7^71=Unit digit in [(7^4)^17 x 7^3]=((1x3)=3   Therefore, Required digit=Unit digit in (3x6x3)=4   Answer is 4
<result>C</result>
what is the unit digit in the product (3^68 x 6^59 x 7^71) ?