What is the explicit rule for this geometric sequence? 4,4/5,4/25,4/125,... Responses an=154^n1 a subscript n end subscript equals fraction 1 over 5 end fraction times 4 to the power of n minus 1 end exponent an=4(15)^n1 a subscript n end subscript equals 4 times left parenthesis fraction 1 over 5 end fraction right parenthesis to the power of n minus 1 end exponent an=4(1/5)^n a subscript n end subscript equals 4 times left parenthesis fraction 1 over 5 end fraction right parenthesis to the power of n end exponent an=1/54^n