alleryIn an AP, a = 7 and d = −2. Find a₁₂.
A+15
B−13
C+13
D−15
Answer & Solution
Correct answer: D. −15
We have a₁₂ = 7 + 11 × (−2).
That is a₁₂ = 7 − 22.
So a₁₂ = −15.
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