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+### Typescript
+
+1486. XOR Operation in an Array
+
+
+```typescript
+function xorOperation(n: number, start: number): number {
+  let ans=0
+  for(let i=0;i<n;i++){
+    ans^=(start+2*i)
+  }
+  return ans
+};
+```
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+### Typescript
+
+2545. Sort the Students by Their Kth Score
+
+```typescript
+function sortTheStudents(score: number[][], k: number): number[][] {
+    return score.sort((a,b)=>b[k]-a[k])
+};
+```
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