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In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
a. Both assertion (A) and reason (R) is true and reason (R) is the correct explanation of assertion (A).
b. Both assertion (A) and reason \( (R) \) is 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: Sum of first hundred even natural numbers divisible by 5 is 500 .
Reason: Sum of first n-terms of an A.P. is given by \( \mathrm{S}_{\mathrm{n}}=\frac{\mathbf{n}}{2}[\mathbf{a}+l] \), where \( l \) is last term.
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