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OpenStudy (anonymous):
Find the 20th number Of 4,8,12,
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OpenStudy (lgbasallote):
hmm first ask yourself this...is that arithmetic progression? or geometric?
OpenStudy (anonymous):
Geometric
OpenStudy (anonymous):
What kind of operation ?
OpenStudy (anonymous):
Multiplication
OpenStudy (lgbasallote):
hmm try this to check.. 8/4 = 12/8 ?
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OpenStudy (anonymous):
Oh then addition
OpenStudy (anonymous):
If it's addition, it's just +4 every time.
OpenStudy (anonymous):
So 80.
OpenStudy (lgbasallote):
right! so the equation for arithmetic progression is... an = a1 + (n-1)d can you tell me which of these are given..which you're looking for? an = ? a1 = ? n = ? d = ?
OpenStudy (anonymous):
@Numbers Is it crystal clear to you?
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