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Which term of the AP : 121, 117, 113, . ...

Which term of the AP : 121, 117, 113, . . ., is its first negative term?[Hint : Find n for `a_n<0`]

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Verified by Experts

Here, a is the first term, d is the common difference and n is the number of terms.
Given:
First Term, `a = 121`
Common difference, `d = 117 -121 = - 4`
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