The value of $13⨀ \limits_{15}18$ where $⨀ \limits_{15}$ is multiplication modulo 15 :
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9
$13⨀ \limits_{15}18$ = Remainder $\left(\frac{13×18}{15}\right)$
$=\frac{225}{15}+\frac{9}{15}=15×15+9$
∴ Remainder = 09