Maths Maths Puzzle Logical Reasoning Coding Decoding

If fof(x)=1/x then f(x) value is?

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Maths Other Question

How many triangles at most can you make using six matchsticks?

Details and Assumptions:

A matchstick is assumed to be a unit segment. You cannot break the matchsticks.
The triangles don't necessarily have the same size, but they may not be degenerate.
Vertices of triangles must be intersections of matchsticks. 3x + 2 = 5y = 7z + 6 Solve for x,y,z