if n = 9 ^ 11 – 9 , what is the units digit of n ?
always divide the power ( incase 11 ) by 4 and use the remainder as the new power . the question now becomes 9 ^ 3 - 9 . now 9 ^ 3 has last digit 9 . , we subtract 9 from 9 , thus 9 - 9 = 0 is the answer . option a
divide(log(9), log(power(9, 11)))