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:

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: