The letters of the word ABACUS have been arranged in the shape of a
triangle. How many different ways can you find to read the word
ABACUS from this triangular pattern?
Label the joints and legs of these graph theory caterpillars so that the vertex sums are all equal.
Label this plum tree graph to make it totally magic!
Each of the two main diagonals of the puzzle must have the
numbers 1 to 9.
Within the 9x9 pattern there is a highlighted "rectangle" with
its width four and length six cells respectively. Each width of the
"rectangle" outline must contain all the four numbers 1 to 4.
Similarly, each length of the "rectangle" must contain all the six
numbers 1 to 6.