Which formula could be used to find the n th term for the geometric sequence 2,6,18,54 ?
A
A sub n is equal to 3 times 2 to the n th powerB
A sub n is equal to 2 to the n th powerC
A sub n is equal to 2 times 3 raised to the n minus 1 powerD
A sub n is equal to 6 times 2 raised to the n minus 1 power