If a+b=13 and a³+b³=559, find a²+b².

If 10 → 4, 18 → 6 and 30 → 8, then 48 → ?

If 53 = 10 and 78 = 49, then 67 is equal to

Find the remainder when 49^49 + 1 is divided by 6.

Find the smallest perfect square number which is exactly divisible by 4, 5, 6, 15 and 18 :

If x be a non-zero rational number and y be an irrational number, then choose the correct option.