Question app.codility.com My Solution app.codility.com function solution(A) { if (A.length === 0) return 1; let arrSum = A.reduce( (prev, curr) => prev + curr ); let permSum = (1 + A.length + 1)*(A.length + 1)/2; return permSum-arrSum; } N…

Question app.codility.com My Solution app.codility.com function solution(X, Y, D) { return Math.ceil((Y-X)/D); }

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