Question

1. choose the best answer.

conjecture: when it is completed, one world trade center in new york will stand 1,776 feet tall and be the tallest building in the world.

tallest buildings in the world by 2013

building	location	height (feet)	completion year
one world trade center	new york	1,776	2014
lotte world tower	south korea	1,819	2016
pang an international finance center	china	1,965	2017
abraj albait tower	mecca	1,972	2012
shanghai tower	shanghai	2,073	2014
burj khalifa	dubai	2,717	2010

is this conjecture true?
○ no. shanghai world financial center is a counterexample.
○ no. international conference center is a counterexample.
○ no. burj khalifa and abraj al bait tower are both counterexamples.
○ yes.

Explanation:

To determine if the conjecture is true, we check the heights of other buildings. Burj Khalifa (2,717 feet) and Abraj AlBait Tower (1,972 feet) are both taller than One World Trade Center (1,776 feet) and were completed before or around its completion year (2014). The first two options mention incorrect buildings (Shanghai World Financial Center and International Conference Center aren't in the table as counterexamples). So the conjecture is false, and Burj Khalifa and Abraj AlBait Tower are counterexamples.

Answer:

No. Burj Khalifa and Abraj Al Bait Tower are both counterexamples.