thirty-two million five thousand eight
72, 36, 144
its skip a number times 2 times two
then the number you skipped, times two to get the one after the next one then times 3 then so on.
Equal too 4 wholes that is my answer
Answer:
first Let's find the common difference
an=a1+(n-1)d
let's take A2 that is 18
so 18=7+(2-1)d
18=7+d
d=11
so the next term is going to be 40+11 that is 51