Need asap got 5 minutes will give anything what is the sum of the first 7 terms of the series −3+6−12+24− ?

Answer

129

Explanation

−3+6−12+24−...

The series is a geometric progression.

The first term (a) = -3

Common ration (r) = 6/-3

                          = -2

The formula for getting the sum of a geometric progression is

Sum = a(rⁿ - 1)/(r - 1)

          = -3(-2⁷ - 1)/(-2 - 1)

          = -3(-128-1)/-3

            = (-3 × -129)/-3

              = -129

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

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step-by-step explanation:

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