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11-06-2021
Mathematics

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if the 3rd and the 9th term of an ap are 4 and -8 respectively, which term of this a.p is zero?

if the 3rd and the 9th term of an ap are 4 and 8 respectively which term of this ap is zero class=

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11-06-2021

Answer:

The 5th term.

Step-by-step explanation:

a3 = a1 + 2d = 4

a9 = a1 + 8d = -8

Subtracting :

6d = -12

d = -2

So it's the 5th term because:

a5 = a3 + 2(-2)

= 4 - 2(2) = 0

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