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# Rule of Sum and Rule of Product

Seek simple and succinct solutions in these systems by sussing-out the significant symmetries.

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How many triangles are there in the diagram above?

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A K**

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Zandra Vinegar**

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How many 4 -digit positive integers have 2 or more zeroes?

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Jay Steller**

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How many parallelograms are formed when a set of 5 parallel lines intersects a set of 4 parallel lines?

**Details and Assumptions**

- All parallel lines are extended indefinitely.

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dinesh R**

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How many triangles are there in the above image?

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Calvin Lin**

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