SOLUTION: Am totally new to sequences and kinda lost on this problem. Need help for mathletes competition tomorrow What is the 21st term of the sequence 3,6,12,24

Question 213951: Am totally new to sequences and kinda lost on this problem. Need help for mathletes competition tomorrow
What is the 21st term of the sequence 3,6,12,24
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
What is the 21st term of the sequence 3,6,12,24
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1st determine if the sequence is arithmetic or geometric
Yours is geometric with a(1)=3 and r=2
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2nd: Form for the nth term:
a(n) = {a(1))r^(n-1)
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3rd: a(21) = 3*2^20 = 3* 1048576 = 3145728
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Cheers,
Stan H.
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