Question

Find the sum of: (-5) + (-8) + (-11) +…..+ (-200) PLEASE WITH PROPER STEPS. Don't spam

Answer 1

Step-by-step explanation:

a = -5

d = -3

An = -200

.°. an = a +(n-1)d

-200 = -5+(n-1)(-3)

- 200 = - 5 -3n+3

- 200 = -2-3n

- 198 = - 3n

n = 198/3 = 66

So,

Sn = n/2{2a+(n-1)d}

= 66\2{2×(-5)+(66-1)(-3)}

= 33{-10-195}

= 33 × (-205)

= -525

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