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A bank customer had \$100 in his account. He then made 6 withdrawals, totalling \$100. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals     Balance left
\$50             \$50
25              25
10              15
8               7
5               2
2               0
---             ---
\$100             \$99

When he added up the columns as above, he assumed that he must owe \$1 to the bank. Was he right?

[Ref: ZEZC]

There is no reason whatever why the customer's original deposit of \$100 should equal the total of the balances left after each withdrawal. The total of withdrawals in the left-hand column must always equal \$100, but it is purely a coincidence that the total of the right-hand column is close to \$100. For example:

Withdrawals     Balance left
\$5             \$95
10              85
85               0
---             ---
\$100             \$180

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