72 +68+64 +....
+40
(Find n=? Sn=?)
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Answer:
i don't know is the answer
Step-by-step explanation:
i + don't+know + is+the+answer
Answer:
a1=72
d=4
an=0
an=a+(n-1)d
0=72+(n-1)4
0=72+4n-4
0=68+4n
4n=68
n=68/4
n=17