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Question
Which term of the progression 36 + 33 + 30 + ... is zero?
Sum
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Solution
a = 36
d = 33 − 36
d = −3
an = 0
an = a + (n − 1)d
0 = 36 + (n − 1)(−3)
0 = 36 + 3n + 3
n = `39/3`
n = 13
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