Question

OR
In an Arithmetic Progression, if d= - 7, n=7, an=-35, then find a.​

Answer 1

$|Given |$

d = (- 7) , n = (7) , an = (-35)

a = ?

we know that,

$Arithmetic \: \: Progression : \: an = a\: + (n - 1)d$

substitute the values in the given arithmetic progression.

then,

$- 35 \: = \: a \: + \: (7 - 1)( - 7)$

$- 35 \: = \: a \: + \: 6( - 7)$

$- 35 \: = \: a \: - \: 42$

$a \: = \: 42 \: - \: 35$

$a \: = \: 7$

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