The first and last term of an ap are 1 and 121 find the number of terms in the ap

In an arithmetic progression (AP), you can find the number of terms using the following formula:

Number of terms (n) = [(Last term - First term) / Common difference] + 1

In your case, you're given the first term (1), the last term (121), and it's an AP, so the common difference is the same between all terms.

n = (121 - 1) / Common difference + 1

n = 120 / Common difference + 1

To find the number of terms, we need the common difference. Since the common difference is not provided, we can't determine the exact number of terms without that information.

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