Mashaal Masha
The first term of a sequence is 9. Each term after the first is 4 times the preceding term. If $w$ represents the $n$th term of the sequence, which equation gives $w$ in terms of $n$?
Difficulty: Hard
A: 

$w=4(9^{n})$

B: 

$w=4(9^{n-1})$

C: 

$w=9(4^{n})$

D: 

$w=9(4^{n-1})$

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