Chickpea, commonly known as "Chana" in Hindi, is a widely consumed legume in India. It is used in various culinary dishes and is a staple source of protein.
Assertion (A): The sum of the first fifteen terms of the AP $21, 18, 15, 12, \dots$ is zero.
Reason (R): The sum of the first $n$ terms of an AP with first term $a$ and common difference $d$ is given by: $S_n = \frac{n}{2} \left[ a + (n - 1) d \right].$