Find the correct alternative
$49, 343, 64, ?, 81, 729$

1024

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512

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778

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182

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Solution

The correct option is B $512$
The first and second terms are square and cube of $7,$ $5^{t h}$ and $6^{t h}$ terms are square and cube of $9.$ So third and fourth terms are square and cubes of $8.$
$8^{3} = 512$

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