yhurdleprimera yhurdleprimera

13-04-2018
Mathematics

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How many ordered pairs of prime numbers (a,b) are there such that a+b=100?

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sqdancefan sqdancefan

13-04-2018

6 pairs with a < b. 12 otherwise.

(3, 97), (11, 89), (17, 83), (29, 71), (41, 59), (47, 53)
and
(53, 47), (59, 41), (71, 29), (83, 17), (89, 11), (97, 3)

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