find four numbers in APwhos sum is 28 and the sum of whos squares is 216
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(a-3d)+(a-d)+(a+d)+(a+3d)=28 → a=7. (a-3d)²+(a-d)²+(a+d)²+(a+3d)²=216 → 4(a²)+20d²=216 → d=±1. Hence, the numbers are 4, 6, 8 & 10.21
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