This sounds very much like The Winnowing, a short story by Isaac Asimov, first published in Analog in 1976.
From the wikipedia summary:
In the year 2005, the world's population of six billion is suffering
from acute famine. The World Food Organization decides on desperate
measures to decrease the population by a process of triage. They
propose to do this by adding selective poisons to certain food
shipments to grossly over-populated areas.
They plan to poison more than 1 in 10 though, aiming for 70% deaths in certain carefully selected regions that were "hopelessly" overpopulated.
They blackmail a scientist named Dr Aaron Rodman to prepare such a poison, based on human lipoproteins, but he refuses to go along with the scheme and prepares a suitable revenge.
At a meeting between him and senior government officials and members
of the World Food Council, he provides sandwiches laced with the LP [lipoprotein] as
refreshment, so that they will die at random, just as they had planned
for so many others. He carefully matches the LP in the sandwiches
(which he also eats) to his own metabolism, so that he will die
quickly and not be guilty of involvement in the scheme.
He hopes that the officials' view of "selective deaths" will be altered by the experience.
The full story can be read at the Luminist archive, in the February 1976 issue of Analog.
2 × 21
is the same QUESTION as7 × 6
(and the meaning of life) because the ANSWER is the same? I doubt the OP would read the other question and know that it's the answer to his question. The Duplicate Rule is stupid - I wish people would stop following it.