Number of terms in Arithmetic progression.

How many terms are there in the AP 20, 25, 30,........140

Expert Solution

In Arithmetic Progression series 20,25,30,......140

a =20 is first term

d = 5 common differnce

n^th term is =140

Therefore to calculate number of terms in above Arithmetic Progression we use formula.

a+(n-1)d =n^th term

20+(n-1)5=140

20+5n-5=140

5n =125

n =25

To calculate no. Of terms in AP we use

a+(n-1)d = n^th term

Tuha Mohd Teeli answered 2 years ago

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