What is the name of the earliest calculating machine which was based on concepts found in modern computers but was unfortunately never built?

What is the name of the earliest calculating machine which was based o

1.	What is the name of the earliest calculating machine which was based on concepts found in modern computers but was unfortunately never built?
A.	Babbage's Difference Engine
B.	Pascal's Adder
C.	Leibnitz's Multiplier
D.	Differential Analyser
E.	None of the above
Answer» B. Pascal's Adder

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What is the name of the earliest calculating machine which was based on concepts found in modern computers but was unfortunately never built?

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