Question

arithmetic sequence is 5,10,15 find 10 is a term of this a.s

Answer 1

10th term = a+(n-1)d
= 5 +(10-1)5
=5+9*5
=5+45
=50

Answer 2

a= 5 a2 - 10
d -5
an=a+(n-1)d
10=5+(n-1)5
5=5n-5
So, n= 2
10 the term = 5+9×5 =50