Question

a = – 2050, l = – 1200, n =18 . Find s and d


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Answer 1

Answer:

I didn't understand your question

Answer 2

Step-by-step explanation:

we know that

Last term l= a+(n-1)*d

-1200 = -2050 + (18-1)*d

this gives

17d = 2050-1200

17d = 850

d = 50

now s (sum of n terms) = n/2(a+l)

= 18/2(-2050+(-1200))

= 9*(-3250)

= - 29250