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Here a= 20.
d=19(1/4)-20.
=-3/4.
t(n)= -1. (Given in the question).
t(n)=a +(n-1)d.
(-1)= 20 + (n-1)(-3/4).
-1-20=(n-1)(-3/4).
(-21)/(-3/4)=n-1.
28=n-1.
Therefore n=28+1=29.
So 29th term will be first negative term.
Hope this helps.
d=19(1/4)-20.
=-3/4.
t(n)= -1. (Given in the question).
t(n)=a +(n-1)d.
(-1)= 20 + (n-1)(-3/4).
-1-20=(n-1)(-3/4).
(-21)/(-3/4)=n-1.
28=n-1.
Therefore n=28+1=29.
So 29th term will be first negative term.
Hope this helps.
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