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

Experts write on key ideas tested in the CAT
The previous two posts discussed a key idea behind counting number of options for the question
Question Sum of three whole numbers a, b and c is 10. How many ordered
Permutation and Combination. Questions 1. Sum of three natural numbers a, b and c is
Fermat’s Little Theorem states that if p is prime then a^p – a is a
Had sent an entry on Euler’s phi function earlier , and thought it would be