Question

a = ? , d = -3 , n = 18 , an = -5​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

an = a+ (n-1) d

-5 = a+ (18-1)× (-3)

-5 = a+ 17×-3

-5=a+-51

-5+51=a

46=a

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