Copyright © University of Cambridge. All rights reserved.

From the second row we see that c, d, e are 1, 2, 4 in some order; and from the third column we see that e> 2. Hence e=4 and we may now deduce that g=8 and so f=5.

(Although their values are not required, it is now also possible to deduce that c=1, a=3, b=9, d=2.)

*This problem is taken from the UKMT Mathematical Challenges.*

View the current weekly problem