Which expression has a negative value? a)−1×−2 b)−1×2×−3×4×−5 C) 1×−2×−3×−4×−5 d)1×−2×3×−4×5

Answer:b)−1×2×−3×4×−5 has a negative value.Step-by-step explanation:Given expressions are a)−1×−2  b)−1×2×−3×4×−5 C) 1×−2×−3×−4×−5 d)1×−2×3×−4×5Firstly we have to multiply the digits with digit then after minus sign.So for a)−1×−2 Solution, [tex]1\times2\ =2[/tex]When two negative signs are multiplied with each other it gives a positive sign.Both digits have a negative sign that means it gives a positive sign.So the solution for 1st expression is [tex]2.[/tex] b)−1×2×−3×4×−5Solution,[tex]1\times2\times3\times4\times5\ =120[/tex]Here three digits have negative sign, two negative gives positive and then multiplied by negative gives negative. So the solution for 2nd expression is [tex]-120[/tex].C) 1×−2×−3×−4×−5 Solution,[tex]1\times2\times3\times4\times5\ =120[/tex]Here four digits have negative sign, two negative gives positive and again two negative gives positive means positive multiplied with positive gives positive.So the solution for 3rd expression is [tex]120[/tex].d)1×−2×3×−4×5Solution,[tex]1\times2\times3\times4\times5\ =120[/tex]Two digits have a negative sign that means it gives a positive sign.So the solution for 4th expression is [tex]120[/tex].Hence the correct option is b.