Question

In an AP a8 = 18d = 3 find a​

Answer 1

$Given \: in \:an \:A.P : a_{8} = 18 \: and \:d = 3$

/* We know that */

$\boxed{ \pink{n^{th} \:term (a_{n}) = a + (n-1)d }}$

$a_{8} = 18$

$\implies a + 7d = 18$

$\implies a + 7 \times 3 = 18$

$\implies a + 21 = 18$

$\implies a = 18 - 21$

$\implies a = -3$

Therefore.,

$\red{ Value \:of \: a } \green { = -3 }$

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