# NCERT Class 11-Math՚s: Chapter – 4 Principle of Mathematical Induction Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for CBSE/Class-8 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-8.

**Question 20**:

Prove that for all

**Answer**:

it՚s true at .

When

it՚s true at .

it՚s true at

Let

Be true

it՚s true at .

∴ By Mathematical Induction

is true for all natural numbers n.