claudia3776
31.08.2019 •
Mathematics
Find the 5th term of the sequence in which t1=8 and tn=3t n-1
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Ответ:
Long way (always works!)
T_5 = 3*T_4,
T_4 = 3*T_3
T_3 = 3*T_2
T_2 = 3*T_1
T_5 = 3*3*3*3*T_1 = 81*T_1 = 81*8 = 648!
Short way (sometimes it works!)
T_n = 3^(n-1) * T_1 (this case is a geometric series of ratio-=3)
T_5 = 3^4*8 = 648
Ответ:
The 2 is called the coefficient
(A.) Is the answer