The first term of a G.P is 7. Find its 4th term, if its common ratio is 3.
a
567
b
280
c
189
d
63
e
21
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Chuks612
9 years ago
Here is an explanation:
a=7,r=3(where a is 1st term and r is the common ratio)
The formula is...
Ar^n-¹
=7(3)^4-1
=7(3)³
=7*27
=189
