Asked by true

Find the number of terms in the aritmetic progession 2,-9,-20,141
Answered by Steve
I assume you meant 2,-9,-20, ...,-141
since d = -9-2 = -11,
2+(n-1)(-11) = -141
-11(n-1) = -143
n-1 = 13
n=14
Answered by Mohamed K
69
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