How many unit squares will there be in pattern 80?

6460

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6478

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6640

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6804

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Solution

The correct option is C 6640
Pattern Number
of rows Number
of
columns Number of
unit squares
1 2 3 $2 \times 3 - 2 = 4$
2 3 4 $3 \times 4 - 2 = 10$
3 4 5 $4 \times 5 - 2 = 18$
4 5 6 $5 \times 6 - 2 = 28$
. . . .
. . . .
. . . .
80 81 82 $81 \times 82 - 2 = 6640$

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