Question

in an arithmetic progression a=28 , d= -4 ,n=7 then an is​

Answer 1

$Given \:a= 28 , d = -4 \:and \: n = 7$

/* We know that , */

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

/* Substituting the values ,we get */

$a_{7} = 28 + ( 7-1) \times (-4)$

$= 28 + 6 \times (-4)$

$= 28 - 24$

$= 4$

Therefore.,

$\red{ Value \:of \: a_{7} } \green { = 4 }$

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Answer 2

$\huge \: answer : \\ \\ a = 28 \\ \\ d = - 4 \\ \\ n = 7 \\ \\ find \: \: a_n \\ \\ formula \: \: used \: \: \\ \\ a_{n} =a + (n - 1)d \\ \\ substitute \: the \: \: values \: \: in \: \: formula \\ \\ a_{n} =28 + (7 - 1) - 4 \\ \\ a_{n} =28 + (6) - 4 \\ \\ a_{n} =28 - 24 \\ \\ a_{n} =4$

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