Question

if for G.P. S2=8 and S4=80 find its first term and common ratio​

Answer 1

common difference is 8/3 and first term is 2/3

Answer 2

Answer:

a = 4/5

r = 10

Step-by-step explanation:

Let the first term of the GP be a and common ratio be r .

S2 = ar

8 = ar ............... (i)

S4 = ar²

80 = ar² .............. (ii)

Dividing euation (ii) by (i) , we get ,

ar²÷ar = 80÷8

r = 10

Substituting this value in equation (i) , we get,

a×10 = 8

a = 4/5

HOPE THIS HELPS YOU

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