There are 7 tumblers on a table, all standing upside down. You are allowed to turn any 2 tumblers simultaneously in one move. Is it possible to reach a situation when all the tumblers are right side up? (Hint: The parity of the number of upside-down tumblers is invariant.)

What is the use of repeating the same action again and again?

Write a note on loop variant?

How will you solve a problem using recursion?

Show that p - c is an invariant of the assignment. P, C : = P + 1, C + 1

Consider two variable m and n under the assignment m, n : = m + 3, n - 1. Is the expression m + 3n an invariant?

What are the important points in which a loop variant is true?

Using a loop variant how will you construct a loop?

Write a note on Recursion.

Write a note on Iteration.