Question

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 1

B

Explanation:

Answer 2

b)−1×2×−3×4×−5 has a negative value.

Explanation:

Given expressions are a)−1×−2 b)−1×2×−3×4×−5 C) 1×−2×−3×−4×−5 d)1×−2×3×−4×5

Firstly we have to multiply the digits with digit then after minus sign.

So for a)−1×−2

Solution,
`1*2\ =2`

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
`2.`

b)−1×2×−3×4×−5

Solution,
`1*2*3*4*5\ =120`

Here three digits have negative sign, two negative gives positive and then multiplied by negative gives negative.

So the solution for 2nd expression is
`-120`.

C) 1×−2×−3×−4×−5

Solution,
`1*2*3*4*5\ =120`

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
`120`.

d)1×−2×3×−4×5

Solution,
`1*2*3*4*5\ =120`

Two digits have a negative sign that means it gives a positive sign.

So the solution for 4th expression is
`120`.

Hence the correct option is b.