The known sequence {an] is an equal ratio sequence. If the sum of n terms in front of gas is Sn = 5 ^ n + K, then the constant k =?

a1=s1=5^1+k=5+k
s2=s1+a2=5^2+k a2=20
s3=s2+a3=5^3+k a3=100
q=a3/a2=100/20=5
a1q=a2
（5+k）×5=20
k=-1

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