Question

if the fifth term term of g.p. is 81 and eight term is 2187 then find third term​

Answer 1

Step-by-step explanation:

if the fifth term term of g.p. is 81 and eight term is 2187 then find third term don't forget for thanks♥

Answer 2

Answer:

a₅ = ar⁵⁻¹ = ar⁴ = 81

a⁸ = ar⁸⁻¹ = ar⁷ = 2187

now,

ar⁷/ar⁴ = 2187/81 = 27

r³ = 27

r = ∛27

r = 3

So, a(3)⁴= 81

a(81) = 81

a = 81/81

a = 1

So,

a₃ = ar³⁻¹ = ar² = 1 (3)² = 3²

= 9

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