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Physics Library

Free Physics Study Material for CSIR NET, IIT JAM, GATE, JEST & TIFR

by Pravegaa Education

Chapter 8 — Permutations and Combinations

Concepts, worked examples and 12 CSIR NET-JRF Part A questions (December 2016 – December 2025) with full solutions. Click Show solution under any question.

Concepts

8.1 The two counting principles

Every counting argument in this chapter is built from two elementary rules. Suppose a task can be carried out in one of two mutually exclusive ways, the first in

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