Assertion: The sum of time to time of an AP is 7 - 4.
Reason: Then its common difference is -4. The common difference of an AP is given by aₙ₊₁ - aₙ.
​a) Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
c) Assertion is true, but the Reason is false.
d) Assertion is false, but the Reason is true.