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

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asked Aug 23, 2019 228k views

1 Answer

Grafix · Answer 1 · 2019-08-29T06:56:32+0000

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)

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

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