Which term of an AP , 24,21,18,15,……………….. is zero?
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Answer:
an = 0
a = 24
d = 21-24= -3
an = a + (n-1)d
0 = 24+ (n-1)-3
-24 = (n-1)-3
-24/-3 = n-1
8 = n-1
n = 8+1 = 9
n = 9
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