Easier ones this time:
(1) Find three numbers which are in an Arithmetic Progression and the conditions being:
all numbers are distinct
each number should be a perfect square
as multiple sets are possible, find the least one (means where the range - that is, the difference between the largest number and the smallest number - is the lowest)
(2) Why it is impossible to find the next term in the series: 1, 9, ___ (Not because, the 3rd term is NOT provided....there is a special reason for it !!) ?