Question

Vadim has a square piece of paper divided into nine cells; he folds the paper as shown overlapping horizontally and then vertically so that the grey square ends on top. Vadim wants to write the numbers from 1 to 9 into the cells so that once the paper is folded, the numbers would be in increasing order with 1 on the top layer. What numbers should he write instead of a, b, c?

a) 5, 1, 6, 3, 4, 9, 7, 8, 2
b) 5, 1, 6, 3, 4, 7, 8, 2, 9
c) 1, 2, 3, 4, 5, 6, 7, 8, 9
d) 1, 2, 3, 4, 5, 7, 6, 9, 8

Answer 1

Vadim should write the numbers a) 5, 1, 6, 3, 4, 9, 7, 8, 2 instead of a, b, c.

Step-by-step explanation:

Vadim should write the numbers a) 5, 1, 6, 3, 4, 9, 7, 8, 2 instead of a, b, c.

To solve this problem, Vadim needs to determine the order in which the cells are folded. Starting from the top left, the cells are folded/collapsed in the following order: 5, 1, 6, 3, 4, 9, 7, 8, 2. By following this order, when the paper is folded, the numbers will be in increasing order with 1 on the top layer. Therefore, option a) is the correct answer.