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10-05-2024
Mathematics

Answered

Refer to the earlier exercise. By 1922 there were more applications for radio station licenses than the number of three-letter call signs available. A radio station in New Orleans applied for and was granted the call sign WAAB.

(a) How many four-letter call signs starting with W are possible?
(b) How many four-letter call signs starting with W or K are possible?

Answer :

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