Solution
Let the edge of the cube = $$a$$ cm
Number of edges in a cube = 12
Sum of all the edges = $$12a = 84$$
=> $$a = \frac{84}{12}=7$$
$$\therefore$$ Volume of cube = $$a^3$$
= $$(7)^3=343$$ $$cm^3$$
=> Ans - (B)
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