2007 US Mint Silver Proof Set B

2007 began the Presidential $ Coin series: George Washington, John Adams, Thomas Jefferson, James Madison. A special surprise if you purchase this item and can answer this question: Which two of these were early rivals, but later carried on a very friendly and active correspondence for many years, then died on the same date (name the date and year).
There are seven silver coins, beginning with the five Statehood Quarters, the dime and the Half Dollar. The 4 presidential coins, the Native American coin, the nickel and the cent are not silver.
Very nice frosty images with mirror backgrounds.
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