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Determine the number of terms in the ter...

Determine the number of terms in the terms in the A.P. 3,7,11…407. Also, find its 20th term from the end.

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Here, first term `a=3` and common difference `d=4`.
Let there be n terms in the given A.P. Then,
`n ^(th)`term `=407`
`⇒407=3+(n−1)×4`
`⇒n=102`
So, there are 102 terms in the given A.P.
Now, `20 ^(th)` term from the end ...
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