which term of sequence , -9/4, -2, -7/4.... is zero?
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a=-9/4
d=-2-(-9/4)
=-2+9/4
=-8+9/4
=1/4
an =0
a+(n-1)d =0
-9/4+(n-1)1/4 =0
-9/4+n/4-1/4=0
-9+n-1/4 =0
-10+n=0
n = 10th term
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