write equation of nth term of AP and find (n-4)th term.
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tn = a + ( n - 1 ) × d
Let the value of d is 4
tn = a + ( n - 1 ) × 4
tn = a + 4n - 4
tn - a = 4n - 4
tn - a / 4 = n - 4
( n - 4 ) = tn - a / 4
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