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শূন্যস্থানে আলোর বেগ কত?

(3.9986 \pm 0.003) \times 10^{8} m / s e c

(2.9986 \pm 0.003) \times 10^{8} m / s e c

(3.9986 \pm 0.003) \times 10^{6} m / s e c

(2.9986 \pm 0.003) \times 10^{10} m / s e c

ANS : 2

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