The expression for $n^{t h}$ term of an AP is

dn + (a - d)

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dn + (a + d)

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d (n + 1) + a

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d (n - 1) - a

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Solution

The correct option is A dn + (a - d)
The expression for $n^{t h}$ term of an AP is
$a_{n} = a + (n - 1) d$
$a_{n} = a + n d - d$
$a_{n} = d n + (a - d)$

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