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SAT Math Practice Question #31294 - SATify | SATify

#31294

counting

exponential

sequences and series

medium

75 sec

The first term of a sequence is 64. Each term after the first is half of the preceding term. If $T_{n}$ represents the $n$ th term of the sequence, which equation gives $T_{n}$ in terms of $n$ ?

A.

$T_{n} = 64 (2^{n - 1})$

B.

$T_{n} = 64 (\frac{1}{2})^{n - 1}$

C.

$T_{n} = 2 (6 4^{n - 1})$

D.

$T_{n} = \frac{1}{2} (6 4^{n - 1})$