If [(243)^x]*[(463)^y] = n, where x and y are positive integers, what is the units digit of n?
(1) x + y = 7
(2) x = 4
OA A
(1) x + y = 7
(2) x = 4
OA A
243 = 3^5tritrantran wrote:If [(243)^x]*[(463)^y] = n, where x and y are positive integers, what is the units digit of n?
(1) x + y = 7
(2) x = 4
OA A
463 ends with a 3. So we have to know how many times we will multiply 3's at the end of each numbers.
1) 7 times - SUF
2) we dont know Y - INSUF
Choose (a)
