Which term of the AP : 121, 117, 113, . . ., is its first negative term? [Hint : Find n for an < 0]
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a=121. d=(117-121)=-4
AND Nth Term is negative so
Tn<0
a+(n-1)d<0
121+(n-1)(-4)<0
121<(n-1)4
121/4 (121/4)+1 n>125/4 n>34.something so number that greater then 34 and smallest is 35 .. Thus 35th Term is it's First NEGATIVE TERM..
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