感激不尽啊!数列t1,t2,t3,...,tn,中,t1=23,n>1时,tn=tn-1-3,当n为何值得时候是的tn=-4?

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感激不尽啊!数列t1,t2,t3,...,tn,中,t1=23,n>1时,tn=tn-1-3,当n为何值得时候是的tn=-4?感激不尽啊!数列t1,t2,t3,...,tn,中,t1=23,n>1时,

感激不尽啊!数列t1,t2,t3,...,tn,中,t1=23,n>1时,tn=tn-1-3,当n为何值得时候是的tn=-4?
感激不尽啊!
数列t1,t2,t3,...,tn,中,t1=23,n>1时,tn=tn-1-3,当n为何值得时候是的tn=-4?

感激不尽啊!数列t1,t2,t3,...,tn,中,t1=23,n>1时,tn=tn-1-3,当n为何值得时候是的tn=-4?
tn=t(n-1)-3
tn-t(n-1) =-3
tn - t1 = -3(n-1)
tn = 26-3n
tn =-4
26-3n=-4
3n=30
n=10

tn = 26-3n
tn =-4
26-3n=-4
3n=30
n=10