Question

A13=37 d=3 find a=? ,s13=?

Answer 1

Answer:

$\boxed {\blue{given = > }}$

a¹³= 37, d= 3, a=?, s¹³=?

${a}^{13 } = 37 \\ a + 12d = 37 \\ a + 12(3) = 37 \: \: \: { \: given = 3} \\ a + 36 = 37 \\ a = 37 - 36 \\ \orange{a = 1}$

Now:-

${s}^{13} = \frac{n}{2} (a + {a}^{n} ) \\ {s}^{13 } = \frac{13}{2} (1 + 37 )\\ {s}^{13} = \frac{13}{2} (38) \\ {s}^{13} = \frac{13}{2} \times 38 \\ {s}^{13} = 13 \times 17$

${ \green{ {s}^{13} = 221}}$

$\mathfrak \red{plz \: mark \: me \: brainliest \: for \: m \gamma \: full \: } \\ \mathfrak \purple{explanation}$