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## Homework Statement

suppose i measure the time t for 20 oscillations fro a pendulum. the period is T.

## Homework Equations

Since T = t / 20

delta T = delta t right?

## The Attempt at a Solution

since the 20 is a numerical value, it does not come in the error propagation, does not? when i used the above equation, i can't get the required answer but when i divide by 20, the answer is obtained.

can someone explain why?