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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 points)

This problem is for grade 1 - 10 students only.

Deadline expired on 10 December 2014.

Statistics on problem C. 1252.
 190 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. Unfair, not evaluated: 1 solution.

• Problems in Mathematics of KöMaL, November 2014

•  Támogatóink: Morgan Stanley