Mathematical and Physical Journal
for High Schools
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Problem C. 1252. (November 2014)

C. 1252. The product of four consecutive odd numbers ends in 9. What may be the digit preceding the 9 in the product?

(Matlap, Cluj)

(5 pont)

Deadline expired on December 10, 2014.


Statistics:

189 students sent a solution.
5 points:104 students.
4 points:16 students.
3 points:17 students.
2 points:20 students.
1 point:19 students.
0 point:3 students.
Unfair, not evaluated:10 solutions.

Problems in Mathematics of KöMaL, November 2014