Triangle from sticks

Bob the boulder has many sticks of length 3,5 and 7 . He wants to form triangles each of whose edges consists of exactly 1 stick. How many non congruent can be form with the sticks.

Correct answer:

n =  9

Step-by-step explanation:

3+3<7 333 335 355 357 377 555 557 577 777  n=9



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