Question

What is the least​ four-digit number in the first 15 rows of​ pascal's triangle?

Answer 1

Please find the attached file for a better understanding of the explanation given here.

the attached diagram is a generated image of the first fifteen rows of a pascal's triangle. As can be seen from the image, the least​ four-digit number in the first fifteen rows of​ pascal's triangle is 1001.

In the diagram attached that number is present in the very last row and is highlighted using a yellow rectangle.