Question

Find the 20th term of an ap is 12,7,2....​

Answer 1

Answer:

Henceforth, T₂₀ = -83 means -83 is the 20th term of arithmetic series i.e., 12,7,2...

Answer 2

Answer:

The 20ᵗʰ term of the AP is - 83.

Step-by-step-explanation:

The given AP is 12, 7, 2, ...

a = t₁ = 12

d = t₂ - t₁ = 7 - 12 = - 5

Now, we know that,

tₙ = a + ( n - 1 ) * d - - - [ Formula ]

⇒ t₂₀ = 12 + ( 20 - 1 ) * ( - 5 )

⇒ t₂₀ = 12 + 19 * ( - 5 )

⇒ t₂₀ = 12 - 95

⇒ t₂₀ = - 83

∴ The 20ᵗʰ term of the AP is - 83.