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n and a if an=4 , d=2 and Sn=-14
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Answered by
0
Answer:
215
Step-by-step explanation:
Answered by
0
Answer:
a=-2 and n=2
Step-by-step explanation:
an=a+2n-2
a=2n-6 equation 1
sn=n/2(a+an)
-14=-14/2(2n-6+4)n=2
substitute in equation 1
a=2*2-6
a=4-6
a=-2
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