How to play the Dice Game for Runescape (aka Dicing):
When you see someone saying 60 x 3 or anything higher then x 2-It's usually a scammer looking to take your money and dip-out with it making them however much you gave them richer.
So to explain what the 50x2 and phrases like that means-This means when the host(The Dice Roller) rolls the dice if it rolls a 50 or above you win your money back in double hence the x2.*(I'M JUST USING 50 AND X2 AS A EXAMPLE.)*
Whenever you want to play the "Dice Game" you'll find someone hosting a game and they'll trade you and you'll put your bet up. BEFORE YOU DO THAT THOUGH MAKE SURE TO JOIN WHOEVERS FRIEND CHAT HE TELLS YOU TO-USUALLY YOU'LL HAVE TO ASK "WHAT FC?" And he/she should tell you~however if they do not or just ignore you and keeps trading just walk away cause' it's a scammer.
So assuming you found a good Dice Game host and joined a legit Friend Chat the host will then roll the dice after it chooses the number it will pop-up in your PUBLIC CHAT BOX. Saying something like this-PARTY DICE ROLL IS 55 or whatever number got rolled, You will then look at that number and use step 2.
Claiming your prize-If you won the host will say "WINNER" you will then trade him/her and they will give you your gold or items.(Some people like to try to give doubles back in trash items-Just ask for GP.)