SAT Math Practice Question #28311 - SATify | SATify
#28311
number theory
modular arithmetic
hard
150 sec
For n a positive integer, let R(n) be the sum of the remainders when n is divided by 2,3,4,5,6,7,8,9,and 10. How many two-digit positive integers n satisfy R(n+1)−R(n)=1?