Easy Way Of Solving Square And Cube In A Series

Which of the following is an easy way of providing credit to the farmer community ?

Calculation of square root and cube root

An easy way of obtaining Cl_2 gas in the laboratory is :

Problem-solving can be easy and fun for the students if

A sphere and a cube have same surface area. What is the ratio of the square of volume of the sphere to the square of volume of the cube ?

The sum of an infinite geometric series is 2 and the sum of the geometric series made from the cubes of this infinite series is 24. Then the series is: