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Omni-MATH / For integers a,b,c,d, let f(a,b,c,d) denote the number of ordered pairs of integers (x,y)∈1,2,3,4,5² such that ax+by and cx+dy are both divisible by 5. Find the sum of all possib… · Discussion

Discussing For integers a,b,c,d, let f(a,b,c,d) denote the number of ordered pairs of integers (x,y)∈{1,2,3,4,5}² such that ax+by and cx+dy are both divisible by 5. Find the sum of all possib… · Omni-MATH

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