1. It's About Time, in Langley, British Columbia, is Canada's largest custom clock manufacturer. They have a grandfather clock that, on the hours, chimes to the time of day. For example, at 4:00 PM, it chimes 4 times. How many times does the clock chime in a 24-h period?

I tried using the formula Sn = n/2(t1 + tn) and Tn = T1 + (n - 1)d

This is what I did:

Tn = T1 + (n - 1)d

Tn = 1 + (24 - 1)1

Tn = 24

I plugged in 1 for T1 because I assume the first time is 1 PM... I put 24 for n (n = number of terms) because 24 is how many hours there are. And I plugged in 1 for d because I guess the difference is 1.

Sn = n/2(t1 + tn)

S24 = 24/2 (1 + 24)

I plugged in 24 for n (number of terms), 1 for first term, and 24 for tn.

What I did was wrong, and I don't know what to do here...

The correct answer is 156 times.