Question

Find the 20th term of the ap 12,8,4

Answer 1

Let first term be a and common difference be d.

a = 12
d = 8 - 12 = -4

So 20th term = a + 19d
= 12 + 19(-4)
= 12 - 76
= -64


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Answer 2

a = 12
n=20
d= second turm - first turm
so
d= 8-12= -4
and formula = a+(n-1)d
12+(20-1)(-4)
12+19(-4)
12-76= -64