If first term $a$, common difference $d$ and number of terms $n$ are known, the sum is —

Question

Accepted Answer

$\dfrac{n}{2}\{2a + (n - 1)d\}$

Answer

$\dfrac{n}{2}\{a + (n - 1)d\}$

Answer

$n\{2a + (n - 1)d\}$

Answer

$\dfrac{n}{2}\{2a + nd\}$

If first term aaa, common difference ddd and number of terms nnn are known, the sum is —