Question

If t3=20,t6=160, find S,​

Answer 1

Answer:

Step-by-step explanation:

t^3=120

t^6=160

Dividing both the equation, we get

t^3=4/3

t=cube root (4/3)

Answer 2

Answer:

S₇=635

Step-by-step explanation:

t₃=ar²=20

t₆=ar⁵=160

by dividing both eqaution, we get

r=2

a=5

r>1, so S₇=a*(rⁿ-1/r-1)

S₇=5*(2⁷-1/2-1)

S₇=5*(128-1/1)

S₇=5*127

S₇=635(ans)