Question

The sum of an AP 20, the first terms is 8 and the common difference is
-2. Find the number of terms in the series​

Answer 1

Answer:

sn= n/2(2a+(n-1)d

20 = n/2 (2(8) + (n-1)-2

20 = (16+2-2n)

20-18. = (-2n)

2 = =-2n

n=1

Answer 2

Step-by-step explanation:

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