Play With Your Math

@playwyourmath.bsky.social

117 Followers 1 Following

By @joeykelly.bsky.social and @xyu119.bsky.social

"Some numbers have digits that are: like 4321, always decreasing; like 3214, sometimes decreasing; like 1134, never decreasing. Using only 1s, 2s, 3s, and 4s, how many 4-digit numbers are never decreasing?"
On this road, a step takes you one space, such as from 3 to 4, and a jump multiplies your space by 3, such as from 3 to 9. The fastest way from 1 to 10 is 3 moves: 1 jumps to 3, 3 jumps to 9, and 9 steps to 10.