Find the number of term in 3,8,13,18
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3, 8, 13, 18
d = 8 - 3 = 5
a = 3
An = 18
An = a + (n - 1)d
18 = 3 + (n - 1)5
18 = 3 + 5n - 5
18 - 3 + 5 = 5n
20 = 5n
n = 4
IN SHORTCUT
it is clearly seen there are 4 terms............
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