None of them. 1950-series $10 bills remain common among collectors. There's more information at the question "What is the value of a 1950 US 10 dollar bill?".
Right now those are only worth face value. They just aren't rare.
The highest series letter ever used on a $20 bill was E, in the 1950 series. Please check again and post a new question that includes the bill's date and seal color.
In the 1950s, there were several different series of 10 dollar bills issued by the treasury. The series range from A through E, and have different values depending upon the series. For a series A 10 dollar bill, the value online is between 45 and 100 dollars, depending upon condition.
One hundred dollars
What is a 1950 one hundred dollar bill without "In God We Trust" worth?
A circulated 1950 D one-hundred dollar bill is worth about $140. If the bill was not in circulation, it can have a value of about $175.
A Series 1950 $10 bill typically sells for around $20 in circulated condition. The Series 1950A $10 bill has a lower value, usually selling for around $15 in circulated condition. The value can vary depending on factors such as condition and rarity.
$100.
99% of the time a 1950 $10 bill is just worth $10. If it is an error, star note, or in perfect condition it could be worth more.
A series usually means that it is worth alot more than an average bill. It is best to go on eBay to check it out
Unless it is uncirculated, really not much more than $100.
Please see this link for a list of prices
Most 1950-series $5 bills are not especially valuable. The earliest in the series, bearing the 1950 date without a series letter, would be worth $18 to $20 in uncirculated condition.
Please see this link for a list of prices
None of them. 1950-series $10 bills remain common among collectors. There's more information at the question "What is the value of a 1950 US 10 dollar bill?".
Please post a new question with the bill's denomination. Every denomination from $5 to $100 was printed in that series.