Consider the following sequences of offers and acceptances and determine whether in each case there would be a contract.

a. September 1, 2020:

September 2, 2020:

September 3, 2020:

September 4, 2020:

September 5, 2020:

September 6, 2020:

A mails an offer to B.

B receives the offer.

A mails a revocation.

B mails an acceptance.

B receives the revocation.

A receives the acceptance.

RESULT:

b. September 1, 2020:

A mails an offer to B.

September 2, 2020:

B receives the offer.

September 3, 2020:

B wires an acceptance.

September 4, 2020:

B wires a rejection.

September 4, 2020 (later):