Find the nth term of an A. P. given a = -3 and d = 4.
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tn = a + ( n-1) d
tn = (-3) + ( n-1) 4
tn = (-3) + 4n - 4
tn = -3 -4 + 4n
tn = -7 + 4n
tn = 4n -7
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