Question

in a g.p t7=8,t4=1 therefore r=?

Answer 1

t7=8
so  a*r^6=8.........................1
t4=1
a*r^3=1.............................2
so dividing 1 and 2
r^3=8
so r=2

Answer 2

Answer:

$t4 = ar {}^{3}$

$\: \: \: \: \: \: \: ar {}^{3} = 64$

$\: \: \: \: \: r {}^{3} = 64 \div 8 = > 8$

$\: \: r {}^{3} = (2) {}^{3}$

$\: \: \: \: r = 2$

∴ r = 2.

Step-by-step explanation:

@Genius