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MATH / There are nine unit triangles in the three rows of this triangle. If you add…

Problem

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problem

There are nine unit triangles in the three rows of this triangle. If you add three more rows to the bottom of this triangle so that each row has 2 more unit triangles than the previous row, how many unit triangles will there be?

[asy]
draw((0,0)--(15,26)--(30,0)--cycle);
draw((5,8.7)--(10,0)--(20,17.3));
draw((20,0)--(25,8.7)--(5,8.7));
draw((20,0)--(10,17.3)--(20,17.3));
[/asy]

level

Level 2

type

Counting & Probability

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Source and history

task_id
afeb5bf0-a0f0-530f-92c3-0d2546ae7977
task_key
counting~5fand~5fprobability--test--afeb5bf0-a0f0-530f-92c3-0d2546ae7977
task_revision_id
1
config / split
counting_and_probability / test

Official source

initial import