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Binary Operations — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSBinary Operations2 Marks
Question
Determine whether the following operations define a binary operation on the given set or not:
$'+6\ '$ on $S = \{0, 1, 2, 3, 4, 5\} $ defined by, $\text{a}+_6\text{b}=\begin{cases}\text{a}+\text{b},&\text{if a}+\text{b}<6\\\text{a}+\text{b}-6,&\text{if a}+\text{b}\geq6\end{cases}$
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Answer

We have, $S = \{0, 1, 2, 3, 4, 5\}$ and, $\text{a}+_6\text{b}=\begin{cases}\text{a}+\text{b},&\text{if a}+\text{b}<6\\\text{a}+\text{b}-6,&\text{if a}+\text{b}\geq6\end{cases}$
Let $\text{a}\in\text{S}$ and $\text{b}\in\text{S}$ such that $a + b < 6$
Then $\text{a}+_6\text{b}=\text{a}+\text{b}\in\text{S}$ 
$\big[\because  a + b < 6 = 0, 1, 2, 3, 4, 5 \big]$
Let $\text{a}\in\text{S}$ and $\text{b}\in\text{S}$ such that $a + b > 6$
Then $\text{a}+_6\text{b}=\text{a}+\text{b}-6\in\text{S}$ 
$\big[\because\ \text{if a}+\text{b}\geq6$ 
then $\text{a}+\text{b}-6\geq6  = 0, 1, 2, 3, 4, 5 \big]$
$\therefore\ \text{a}+_6\text{b}\in\text{S}$ for $\text{a, b}\in\text{S}$
$\therefore +_6$ defined a binary operation on $S.$

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