Sn = 4 375
a1 = 1 600
an = 675
więc
an = a1*q^( n -1)
675 = 1600*q^( n -1)
q^( n -1) = 27/64
q = 3/4
n = 4
spr.
S4 = 1600*[ 1 - ( 3/4)^4]{ 1 - 3/4) = 1600 *[ 1 - 81/256]/( 1/4) = 6 400*( 175/256) = 4 375
Jest ok.
a2 = a1*(3/4) = 1600*(3/4) = 1 200
a3 = a2*(3/4) = 1 200*(3/4) = 900
a4 = 900*(3/4) = 675
Mamy: 1 600 + 1 200 + 900 + 675 = 4 375
==================================
Odp. Beda 4 nagrody o wartosci 1600zl, 1200 zl, 900 zl i 675 zl.
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Sn = 4 375
a1 = 1 600
an = 675
więc
an = a1*q^( n -1)
675 = 1600*q^( n -1)
q^( n -1) = 27/64
q = 3/4
n = 4
spr.
S4 = 1600*[ 1 - ( 3/4)^4]{ 1 - 3/4) = 1600 *[ 1 - 81/256]/( 1/4) = 6 400*( 175/256) = 4 375
Jest ok.
a2 = a1*(3/4) = 1600*(3/4) = 1 200
a3 = a2*(3/4) = 1 200*(3/4) = 900
a4 = 900*(3/4) = 675
Mamy: 1 600 + 1 200 + 900 + 675 = 4 375
==================================
Odp. Beda 4 nagrody o wartosci 1600zl, 1200 zl, 900 zl i 675 zl.