Question

Please help will reward : medal + fan .
A sequence of numbers starts at 11 and follows the rule " double the last number and then subtract 3 " .
11 , 19 , 35 , 67 , 131 , ....
The sequence continues in the same way .
The number 4099 is in the sequence .
Calculate the number which comes immediately before 4099 in the sequence .
Show your working out ( please try to use " an easy to understand method " )
Thank you :)

Answer 1

Reverse the order of steps and you should get to your answer

\[4099 + 3 = 4102\]
then
\[4102 / 2 = 2051\]