Step-by-step explanation:
What is the 12th number in this sequence, 13, 7, 1, − 5, − 11?
answer
13,7,1,-5,-11 it's an A.P. Series
d=7-13=1-7=-5-1=-11+5=-6
First term a=13
We have to find out 12 th term
T12=a+(n-1)d
=13+(12-1)*-6
=13+11*-6
=13-66
=-53
