જો S={a in R:|2 a-1|=3[a]+2|a|}, જ્યાં [t] એ | vedclass

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Question

$ |2 \mathrm{a}-1|=3[\mathrm{a}]+2\{\mathrm{a}\} $

$ |2 \mathrm{a}-1|=[\mathrm{a}]+2 \mathrm{a}$

Case $-1$ : $\mathrm{a}>\frac{1}{2} $

$ 2

Vedclass · Accepted Answer

$18$

Vedclass · Answer

$ |2 \mathrm{a}-1|=3[\mathrm{a}]+2\{\mathrm{a}\} $

$ |2 \mathrm{a}-1|=[\mathrm{a}]+2 \mathrm{a}$

Case $-1$ : $\mathrm{a}>\frac{1}{2} $

$ 2 \mathrm{a}-1=[\mathrm{a}]+2 \mathrm{a} $

$ {[\mathrm{a}]=-1 \quad 	herefore \mathrm{a} \in[-1,0) 	ext { Reject }} $

Case-$2$: $\mathrm{a}<\frac{1}{2} $

$ -2 \mathrm{a}+1=[\mathrm{a}]+2 \mathrm{a} $

$ \mathrm{a}=\mathrm{I}+\mathrm{f} $

$ -2(\mathrm{I}+\mathrm{f})+1=\mathrm{I}+2 \mathrm{I}+2 \mathrm{f} $

$ \mathrm{I}=0, \mathrm{f}=\frac{1}{4} \quad 	herefore \mathrm{a}=\frac{1}{4} $

 Hence $ \mathrm{a}=\frac{1}{4} $

$ 72 \sum_{\mathrm{a} \in \mathrm{S}} \mathrm{a}=72 	imes \frac{1}{4}=18$

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