Question

How many terms are there in 20, 25, 30, .....140.
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Answer 1

Question:-

• How many terms are there in 20, 25, 30, .....140 ?

Solution:-

Formula to find number of terms in an A. P.

$Number \: \: Of \: \: Terms \: [A. P.] </p><p></p><p> = \frac{Last \: \: Term \: - \: First \: \: Term}{Common \: \: Difference} + 1$

Hence,

Here last term = 140

And first term = 20

And Common Difference = 5

So,

$Number \: \: Of \: \: Terms = \frac{140 - 20}{5} + 1 = 25 \: \: terms \:$