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Omni-MATH / For any positive integer x, define Accident(x) to be the set of ordered pairs (s,t) with s∈{0,2,4,5,7,9,11} and t∈{1,3,6,8,10} such that x+s−t is divisible by 12. For any nonnegati…

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problem

For any positive integer xx, define Accident(x)\operatorname{Accident}(x) to be the set of ordered pairs (s,t)(s, t) with s∈{0,2,4,5,7,9,11}s \in \{0,2,4,5,7,9,11\} and t∈{1,3,6,8,10}t \in\{1,3,6,8,10\} such that x+s−tx+s-t is divisible by 12. For any nonnegative integer ii, let aia_{i} denote the number of x∈{0,1,…,11}x \in\{0,1, \ldots, 11\} for which |Accident(x)|=i|\operatorname{Accident}(x)|=i. Find a02+a12+a22+a32+a42+a52a_{0}^{2}+a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}
Plain-text mathematical notation (without MathML)
For any positive integer x, define Accident(x) to be the set of ordered pairs (s,t) with s∈{0,2,4,5,7,9,11} and t∈{1,3,6,8,10} such that x+s−t is divisible by 12. For any nonnegative integer i, let a_(i) denote the number of x∈{0,1,…,11} for which |Accident(x)|=i. Find a₀²+a₁²+a₂²+a₃²+a₄²+a₅²
Original LaTeX notation
For any positive integer $x$, define $\operatorname{Accident}(x)$ to be the set of ordered pairs $(s, t)$ with $s \in \{0,2,4,5,7,9,11\}$ and $t \in\{1,3,6,8,10\}$ such that $x+s-t$ is divisible by 12. For any nonnegative integer $i$, let $a_{i}$ denote the number of $x \in\{0,1, \ldots, 11\}$ for which $|\operatorname{Accident}(x)|=i$. Find $$a_{0}^{2}+a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}$$

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