Others Exam Numerical Ability Arithmetic

The 30th term of the series 30, 25(1/2), 21, 16(1/2), .....................is

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this is in A.P with d=-4.5,a=30 then
tn=a+(n=1)*d
t30=30+(30-1)*(-4.5)
t30=30+(29)*(-4.5)
t30=30-130.5
t30=-100.5
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