Question

The general term of an arithmetic sequence is un = 11 – 4n. Find the first term and
common difference of this sequence.

Answer 1

Answer:

general term of arithmetic sequence is 11-4n

so 1st term for n=1 we get 11-4.1=11-4=7

2nd term for n=2, we get 11-4.2=11-8=3

3rd term for n=3,we get 11-4.3=11-12= -1

so 1st term is 7 and common difference is (3-7)= -4