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The adjoining figure shows a set of concentric squares.

If the diagonal of the innermost square is $2$ units, and if the distance between the corresponding corners of any two successive squares is $1$ unit, find the difference between the areas of the eighth and the seventh square, counting from the innermost square.

1. $10^{2}$
2. $30$
3. $35^{2}$
4. None of these

Area of first square = 2 sq. units

Area of second square = 8 sq. units

Area of third square = 18 sq. units

Area of fourth square = 32 sq. units

Area of fifth square = 50 sq. units

Area of sixth square = 72 sq. units

Area of seventh square = 98 sq. units

Area of eighth square = 128 sq. units

Difference between areas of eighth and seventh square is 128 - 98 = 30 sq. units (Option B)
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