Question: Take the last letters of the words in "Elon Musk" and concatenate them.
Answer: Let's think step by step.
The last letter of "Elon" is "n". 
The last letter of "Musk" is "k".
Concatenating them is "nk".
So the answer is nk.

Question: Take the last letters of the words in "Larry Page" and concatenate them.
Answer: Let's think step by step.
The last letter of "Larry" is "y". 
The last letter of "Page" is "e".
Concatenating them is "ye".
So the answer is ye.

Question: Take the last letters of the words in "Sergey Brin" and concatenate them.
Answer: Let's think step by step.
The last letter of "Sergey" is "y". 
The last letter of "Brin" is "n".
Concatenating them is "yn".
So the answer is yn.

Question: Take the last letters of the words in "Bill Gates" and concatenate them.
Answer: Let's think step by step.
The last letter of "Bill" is "l". 
The last letter of "Gates" is "s". 
Concatenating them is "ls". 
So the answer is ls.