1. Echo is a single reflection of a sound wave off a surface. Reverberation is the sound or the pattern created by the superposition of such echoes. 2. An echo can be heard only when the distance between...
QUESTION:There are 12 intermediate stations between two places A and B. Find the number of ways in which a train can be made to stop at 4 of these intermediate stations so that no two stopping stations...
Numbers - Natural /Counting, Whole, Integers Explained! Natural Numbers = Counting Numbers N = {1, 2, 3, 4, 5,… infinity} Natural numbers are counting numbers. These are a set of numbers. (Set...