Question Number 10463 by ABD last updated on 10/Feb/17

x∈Z  −1≤∣x−3∣<5 ⇒Σ=?

Answered by mrW1 last updated on 10/Feb/17

−1≤∣x−3∣ is always true    ∣x−3∣<5  ⇔−5<x−3<5  ⇔−2<x<8  ⇔x=−1,0,1,2,3,4,5,6,7  Σx=(((−1+7)×9)/2)=27