Homework Statement
Consider the following infinite geometric series: 1 + (2x/3) + (2x/3)^2 + (2x/3)^3 + ....
for what values of x does the series converge?
Homework Equations
i don't know what converge means, i guessed it was for what vlaues does the geometric series is infinite but...
Homework Statement
in how many different ways can 7 different books be arranged in a row if
a. 3 specified books must be together,
b. two specified boks mus occupy both ends
Homework Equations
i dont udnerstand wether it is a permutation or a combination.
The Attempt at a...