ap:24,21,18–-------
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AP= 24,21,18,.........
d= a2 - a1 = 21 - 24 = -3
a = 24
an = a + (n - 1)d
an = 24 + (n - 1) -3
an = 24 - 3n + 3
an = 27 - 3n
OR
a4 = a3 + d
a4 = 18 + (-3)
a4 = 18 - 3
.°.a4 = 15
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