4 ms·
The examples subtracted 10, 16, etc... Those aren't multiples of 21.
by orbitur 11y ago
The examples subtracted 10, 16, etc... Those aren't multiples of 21.
- chadzawistowski 11y agoSince you scratched off the last digit, 10 is really 100, plus 5 for the digit you scratched off = 105. 105 is a multiple of 21.
- deleted 11y ago[deleted]