Question

Tn=31,a=1,d=3,n=?
with explaination​

Answer 1

child

where is a in the question

Answer 2

Tn= 31

a = 1

d=3

Tn = a + ( n-1)d

31 = 1 + ( n-1) 3

30= 3n -3

33= 3n

33/3= n

11= n

Therefore the value of n is 11