The predecessor of the successor of the number is always the number itself. (true/false)

A whole number which when multiplied by itself then,product is number always number itself

IF + MEANS * AND - MEANS / then 4+8-1.6 =

Complete the series:
1,1,2,4,3,9,_,_,

Anil is taller than Manik. Sohan is shorter than Ali. Sohan is taller than Manik but shorter than Anil.Arrange them from shortest to tallest