Assertion (A): Common difference of the AP: 5,1,-3,-7, … is 4. Reason (R): Common difference of the AP: a_1, a_2, a_3, …, a_n is obtained by d = a_n…

Assertion $\displaystyle (A)$ : Common difference of the $\displaystyle \mathrm{AP}: 5,1,-3,-7, \ldots$ is $\displaystyle 4$ . Reason (R): Common difference of the AP: $\displaystyle \mathrm{a}_{1}, \mathrm{a}_{2}, \mathrm{a}_{3}, \ldots, \mathrm{a}_{\mathrm{n}}$ is obtained by $\displaystyle \mathrm{d}=\mathrm{a}_{\mathrm{n}}-\mathrm{a}_{\mathrm{n}-1}$.