Question

It's urgent ! If n is natural number ,then 92n - 42n is always divisible by

a) 5 b) 13 c)both of these d)none of these

Answer 1

Answer: a
take n common then there will be 50n.
only 5 can divide this.

Answer 2

Step-by-step explanation:

Methods include advanced oxidation processing, distillation, adsorption, ozonation, vitrification, incineration, chemical immobilisation or landfill disposal. Some materials such as some detergents may be capable of biological degradation and in such cases, a modified form of wastewater treatment can be used.