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–1 vote

28 is different because 78/26 = 3 and 39/13 = 3.
99 is different because rest other numbers are divisible by 2.
9 is different because rest other numbers are prime numbers.

A9543B represents a six-digit number in which A and B are digits different from each other. The number is divisible by 11 and also by 8.
What digit does A represent?

Can you arrange the numbers from 1 to 9 on a tic tac toe board in a manner that the numbers in each row, column and diagonal adds up to 15. Remember that you have to use all the 9 numbers and thus you cannot repeat.