Question

If the 3rd and the 9th of an AP are 4 and minus 8 respectively, which term of this AP is zero?

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

T3=4

T9=-8

T3=a+2d=4

T9=a+8d=-8

By eliminating this we get

-6d=12 ok

d=-2

a+2d=4

a-4=4

a=8.

By general formula Tn=a+(n-1)d

Take Tn=0

0=8+(n-1)-2

0=8-2n+2

2n=10

n=5.

The fifth term of a.p is zero