Pre-AlgebraChallenge SharePre-Algebra · Challenge problemEvaluate 1+2−3+4+5−6+7+8−9+⋯+97+98−991+2-3+4+5-6+7+8-9+\cdots+97+98-991+2−3+4+5−6+7+8−9+⋯+97+98−99, where every third number is subtracted and the others are added.Check Show answer Walk through it step by step Practice more like this