Sn = 180, a1=5, d=5, n=?
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Answer:
n=38
Step-by-step explanation:
formula: An=An+(n-1)d
180=5+(n-1)5
180=5+5n-5
180= -10+5n
-5n= -10-180
-5n= -190
n=38
sana makatulong