Question 126

How many terms are there in the AP. 20, 25, 30, ..... , 130?

Solution

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Here we can see that the common difference is 5 and he first term is 20.

We know that the formula of the th term is a+(n-1)d = 130

20+(n-1)5 = 130

n-1 = 22

n = 23

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