Let a Be the Set of All Strings of Decimal

question 147

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 have exactly three 5s?

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Definitions:

Microcredit Programs

Financial services provided to low-income individuals or to those without access to typical banking services.

Repayment Rates

The percentage of borrowed principal that is paid back to lenders within a specified period of time.

Conditional Cash Transfers

Anti-poverty programs in which households receive regular cash transfers (grants) as long as they keep their children in school and participate in preventative health care programs.

Poor Families

Households with income levels below a designated poverty threshold, facing financial hardship.