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

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**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.