Math Problem Statement

• Use ALL the digits in the year 2025 (you may not use any other numbers except 2, 0, 2, and 5) to write mathematical expressions that give results for the numbers 1 to 100. • You may use the arithmetic operations + , - , x, I, square root and ! (see below). • Indices or exponents may only be made from the digits 2, 0, 2, and 5, for example 22 is allowed; it has used two of the twos. • Multi-digit numbers and decimal points can be used such as 20, 202, .02 but you CANNOT make 40 by combining (2+2)0. • Recurring decimals can be used using the overhead dots or bar e.g. 2 ÷ 0.2 Factorials are allowed n! = nx(n - 1)x(n -2)x..x2x1 For example • (2+2)! =4! 4x3x2x1 = 24 • 0! =1

Solution

This task involves creatively combining the digits 2,0,2, and 52, 0, 2, \text{ and } 5 with mathematical operations to generate results for integers from 11 to 100100. Here's the strategy:

  1. Operations allowed: +,,×,÷,factorials (!), powers, and square roots+, -, \times, \div, \text{factorials (!), powers, and square roots}.
  2. Digits: Must use only 2,0,2, and 52, 0, 2, \text{ and } 5.
  3. Multi-digit numbers and decimals: Numbers like 20,202,0.220, 202, 0.2 are allowed but must use the digits 2,0,2,52, 0, 2, 5 exactly once in any combination.

Example Solutions

Numbers 1 to 101 \text{ to } 10:

  1. 1=5(2+20)1 = 5 - (2 + 2^0)
  2. 2=2+0+0+02 = 2 + 0 + 0 + 0
  3. 3=523 = 5 - 2
  4. 4=(2+2)!4 = (2 + 2)!
  5. 5=5+0+0+05 = 5 + 0 + 0 + 0
  6. 6=(5+22)!6 = (5 + 2 - 2)!
  7. 7=5+207 = 5 + 2 - 0
  8. 8=22+228 = 2^2 + 2^2
  9. 9=(2+2)+59 = (2 + 2) + 5
  10. 10=(5×2)010 = (5 \times 2) - 0

Would you like me to continue with numbers 11 to 10011 \text{ to } 100, or elaborate on the explanation for any specific solution?

Related Questions:

  1. What is the factorial operation, and how does it work?
  2. How can exponents be used to generate larger numbers efficiently?
  3. Can recurring decimals simplify expressions for this problem?
  4. What is the significance of using all digits exactly once in this challenge?
  5. How do different combinations of operations like (+,,×,÷)(+, -, \times, \div) influence the results?

Tip:

Start with smaller numbers and simpler operations, then build upon them for more complex results!

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Math Problem Analysis

Mathematical Concepts

Number Theory
Arithmetic Operations
Factorials
Exponents
Decimals

Formulas

Factorial: n! = n × (n-1) × ... × 2 × 1
Exponents: a^b
Basic arithmetic: +, -, ×, ÷

Theorems

Fundamental Theorem of Arithmetic
Properties of Factorials
Properties of Exponents

Suitable Grade Level

Grades 8-12