The previous two posts discussed a key idea behind counting number of options for the question

# Tag: Theory

## Permutations and Combinations

Question Sum of three whole numbers a, b and c is 10. How many ordered

## Questions and solutions on Permutation and Combination

Permutation and Combination. Questions 1. Sum of three natural numbers a, b and c is

## Fermat’s Little Theorem and Euler’s Phi function

Fermat’s Little Theorem states that if p is prime then a^p – a is a

## CAT Number Theory – Modulus

Had sent an entry on Euler’s phi function earlier , and thought it would be