Hello,Originally Posted byNavesh

you've got exactly 5 places where you can put a bead.

For the first red bead you can choice out of 5 places, for the second red bead there are only 4 places left. Similar to the two yellow beads and the blue on:

That means you've got 5*4*3*2*1 = 120 possibilities.: Because you can't distinguish between the first or the second red bead, and you you can't distinguish between the first or the second yellow bead, the amount of possibilities is 4 times to great. So finally:BUT

Greetings

EB