Correct Answer : C
In a four-digit number, the sum of the first two digits is four-fifth of the sum of the last two digits, while the sum of the first and last digits equals the sum of the other two digits.If the first digit is less than the second digit, how many such four-digit numbers exist?
How many three-digit numbers satisfy all the following conditions?
I.When divided by 29 or 3, they leave a remainder of 2 in each case.
II.When divided by 17 and 38, they leave remainders of 6 and 24 respectively.
III.When divided by 18 and 21, they leave remainders of 14 and 8 respectively.
If logn 54=a and logn72=b, find logn 1728 in terms of a and b.