যদি \(\left[ {\frac{{ - a}}{b}} \right] \times \frac{c}{d} = 1\) হয়, তবে  \(\frac{c}{d} = ?\)

1
\(\left[ {\frac{{ - a}}{b}} \right]\) এর গুণক অভেদ
2
\(\frac{b}{a}\)
3
\(\left[ {\frac{{ - a}}{b}} \right]\) এর অন্যোন্য়ক
4
\(\frac{{ - a}}{b}\)

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