Write T for true and F for false statement :

In whole numbers, the multiplicative identity is 1.

Write T for true and F for false statement :

For whole numbers a, b, c, we always have (a + b).c = a.c + b.c.

Assertion (A): For any three whole numbers a, b and c, we have a x (b + c) = a x b + a x c.

Reason (R): The multiplication of whole numbers is associative.

1. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

2. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

3. Assertion (A) is true but Reason (R) is false.

4. Assertion (A) is false but Reason (R) is true.

Assertion (A): On simplifying 5 x 4 ÷ 2 - 1, we get 20.

Reason (R): For simplifying an expression we use DMAS rule.

1. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

2. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

3. Assertion (A) is true but Reason (R) is false.

4. Assertion (A) is false but Reason (R) is true.