Question

If first term of an ap is ‘a’and common difference is ‘a-1’ then find the 20th term

Answer 1

Answer:

It is given that, First term, a=−1, Common Difference, d=−3, and Number of Terms, n=12

∴nth term of any AP is given by:

Tn=a+(n−1)d

Hence,

T12=(−1)+(12−1)(−3)=−34