Which term of the A.P. 121,117,113,...is its first negative term?
Answers
Answered by
5
Answer:
Tn=a+(n-1) d
0=121+(n-1) (-4)
-121=-4n+4
4n=125
4n=31.25=32
Since the value of n is a decimal number, hence 0 is not the term of given A.P
And after 0 the first negative term will come.
Hence the 32nd is the first negative term.
Answered by
2
Answer:
32
Step-by-step explanation:
a=121. d= -4. an<0
an= a+(n-1)d
0=121+(n-1)(-4)
121-4n+4
0=125-4n
since an<0
125-4n<0
n>31 1/4
n=32
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