Question

Which term of the AP : 20, 18, 16, 14….. is –80?

Answer 1

Answer:

Hay mate here is your answer

Step-by-step explanation:

➡️-80=20+(n-1)×-2

➡️40=20+(n-1)

➡️20=n-1

➡️Thus n=21 this -80 is 21st term of ap:20,18,16,14 - - - -

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Answer 2

Answer:

First term (a) = 20

common difference (d) = -2

nth term = a+(n-1) d

-80 = 20 -2n+2

-100 = -2n+2

2n= 102

n=51

therefore, -80 is 51 th term.

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