Question

Is the correct answer (B)

Answer 1

n=1,
a1= 48-1*11=48-11=37
a2= 48 -2*11=48 -22=26

d= 26 -37 = -11
a(n) = a(n-1) - 11

a1=37
a(n) = a(n-1) - 11

Check:
a1=37, a2= a1-11 =37-11=26

a3= 48 -3*11=48-33=15 (using explicit formula),
and a3=a2 - 11=26 -11 =15 (the same answer)

Answer is B.