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11. Consider the following statements and choose the correct option III

Assertion:	The number of protons and neutrons is atomic number.
Reason:	The mass number is sum of protons and neutrons.

If the assertion is true, but the reason is false.
If the assertion is false, but the reason is true.
If both assertion and reason are true, the reason is the correct explanation.
If both assertion and reason are true, the reason is not the correct explanation.

Did you find an error?