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How many terms are there in the AP 13,16...

How many terms are there in the AP 13,16,19,…., 43?

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The correct Answer is:
11
Let it contain n terms. Then , `T_(n)=43 Rightarrow a+(n-1) d=43`
`13+(n-1) xx3 =43 Rightarrow n=11 `
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