Let a Be the Set of All Strings of Decimal

question 17

Short Answer

let A be the set of all strings of decimal digits of length five. For example, 00312 and 19483
are strings in A.
-How many strings in A begin with 774?

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Definitions:

Cost Changes

Adjustments in the financial outlays associated with different business activities or over time.

Break-even Point

The level of sales at which total revenues equal total expenses, resulting in no net profit or loss.

Sales Mix

The combination of different products or services a company sells, usually expressed in terms of the proportion of total sales volume each constitutes.

Fixed Expenses

Costs that do not change with the level of production or sales over a certain period, such as rent, salaries, and loan payments.