# Sj

posted by Mahlogonolo

Mathematics......Under number patterns-Geometric series If a question goes.determine the expression for the nth term of the following sequence if the a) 4th term is 24 and the 7th term is 192 in a geometric sequence.what formula do i use here?because i don't have the whole sequence?

1. Reiny

Sj is not a "school subject" , label it Math to have the corresponding tutors look at it

So if this is a GS, then we are given:

ar^3 = 24 and ar^6 = 192

ar^6 / ar^3 = 192/24
r^3 = 8
r = 2

back in ar^3 = 24
8a = 24
a = 3

now you have a and r, and the whole world of geometric sequences is open to you.

2. Mahlogonolo

Ok im sorry.When you say ar^3=24 what do u mean? And what does '^' mean?

3. PsyDAG

Online "^" is used to indicate an exponent, e.g., x^2 = x squared.

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