class X chapter 1

Que. 1 Check whether 6ⁿ can end with the digit 0 for any natural number n.

Que 2  Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers.

Que 3 . Prove that √5 is irrational.

Que 4  Prove that 3√2+5 is irrational.