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Directions:
In question number $19$ and $20$, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option :
(a) Both, Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(b) Both, Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.
Assertion (A): $4^n$ ends with digit $0$ for some natural number $n$.
Reason (R) : For a number 'x' having $2$ and $5$ as its prime factors, $x^n$ always ends with digit $0$ for every natural number $n$.
In question number $19$ and $20$, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option :
(a) Both, Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(b) Both, Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.
Assertion (A): $4^n$ ends with digit $0$ for some natural number $n$.
Reason (R) : For a number 'x' having $2$ and $5$ as its prime factors, $x^n$ always ends with digit $0$ for every natural number $n$.
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(d) Assertion (A) is false but Reason (R) is true