# Error in python book?

• Python
OrbitalPower

## Main Question or Discussion Point

In python for the absolute beginner, we have this (page 28):

"If an alien has 3 heads, grows 1 more than double his total number of

My formula is: (3 * 2) + 1

(For example, in this sequence, each sequential number is one more than double the next one: 2, 5, 11, 23, 47.)

but he gives (3 + 1) * 2 = 8. But he says one more than double his (current) total. So that seems incorrect.

Who is right?

Related Programming and Computer Science News on Phys.org
CRGreathouse
Homework Helper
"If an alien has 3 heads, grows 1 more than double his total number of heads, how many heads does the alien have?"
I would have thought

3 + (3*2 + 1) = 10

OrbitalPower
Yes. That's right. The error was my own. It says "if an alien has 3 heads, grows 1 more THEN doubleS his total number of heads, how many heads does the alien have."

In fairness, I couldn't really see. That part of the program is only in the console window, not in the source code he gives (for some reason).

Maybe it's meant to say:
"If an alien has 3 heads, grows 1 more then doubles his total number of heads, how many heads does the alien have?"

It's awkwardly-phrased as it is.