An arithmetic sequence has common difference 3 and the third

An arithmetic sequence has common difference -3 and the third term is 345. Find the 24^th term.

Solution

Given Common difference (d)=-3

Third Term T3=345

Find 24 term?

Sol: General Formula: a + (n-1)d

T3= a +(3-1) -3

345= a+ (-6)

a=351

T24= 351+(24-1) -3

=351+23X-3

=351-69

=282

Ans T24 =282