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Category Archives: Number Theory
2021 AMC 12A problem 8
This is a good problem in pattern finding and dealing with offset.
2021 AMC 10 A problem 8
This problem is about student making a mistake. Instead of multiplying by a repeating decimal she multiplies by the finte decimal and the difference is half. The task is to determine the repeating part.
Math Challengers 2022 Question 8 Co op Page 2 on number of digits in binary representation
How many digits are there in the binary representation of ?
Math challengers 2022 Co op problem 12 on factorial and Gaussian addition
How many integers are there such that 1+2+3+…+n divides n! and ?
Posted in Number Theory
Tagged Gauss Contest, Math Challengers, Pascal Contest, Problem Solving
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AMC 8 2011 Problem 24 on sum of primes
In how many ways can 10001 be written as the sum of two primes?
AMC 8 2011 Problem 22
What is the tens digit of ?
Sumant's 1 page of Math 