How many terms are there in the AP

Question:

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

Solution:

To find: number of terms in AP

Also

$\mathrm{d}=16-13$

$\mathrm{~d}=3$

Also

$43=13+n \times 3-3$

So

n = 11 

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