Others Maths Puzzle

In how many ways can a triangle be constructed by connecting three vertices of a regular octagon such that no side of the triangle coincides with the sides of the octagon?
16, 24, 12, 48

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Others Other Question

p=abc ( a 3 digit natural no) , q=uv ( a
2 digit natural no such that u and v
must be distinct integers ) . How many
pairs of p and q are there in total
which gives the same result when
abc*uv ==cba*vu ??? Q1. In how many ways can we express i ) 65^2 ii) 45^2 as sum of squares of two natural numbers ??