The common difference between AP is 25 the a18-a13=_______
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d = 25
a18 = a + 17d......... (1)
a13 = a + 12d......... (2)
subtract equation 2 from 1, we get
a5 = a +5d....... (3)
put d = 25 in equation 3
a5 = a + 125.
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