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You're a magician, and you've just learned the neatest trick.

The trick begins with a number of bags, each containing a different number of marbles.

You have no bags or marbles, so you visit the local magic store.

There you buy 15 black velvet bags.

How many marbles do you need to buy if you use all 15 bags in your trick?

Remember, this is a magic trick B))

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You're a magician, and you've just learned the neatest trick.

The trick begins with a number of bags, each containing a different number of marbles.

You have no bags or marbles, so you visit the local magic store.

There you buy 15 black velvet bags.

How many marbles do you need to buy if you use all 15 bags in your trick?

Remember, this is a magic trick B))

I think 91. Zero is still a number of marbles!

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I'd have to say :) 15 Bags, each with a "different number" of marbles -

120

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 = 120

Edited by interceptor_1972
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You would only need 15, just put one in each bag and then each bag in another bag. Thet way one bag contains 15 marbles and 14 bags, the next 14 marbles and 13 bags, and so on.

Edit: Dang, I forgot about 0 marbles in one bag, should be:

14

Edited by Frost
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