benchmarks.wiki / Public workspace

MATH / The four-digit number 25AB is divisible by nine, with A the tens digit and B the units digit. How many different such four-digit numbers could 25AB represent? · Discussion

Discussing The four-digit number 25AB is divisible by nine, with A the tens digit and B the units digit. How many different such four-digit numbers could 25AB represent? · MATH

Posts

Chronological order within this page.

Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.