Question

mathematical solution find ap of 3.6.9.12. 18term

Answer 1

a= 3

d= 6-3=3

n=18

a18= a+(n-1)d

=3+17*3

=3+51

=54

Answer 2

a=3
d=t2-t1 = 6-3=3
TN=a+(n-1)d
T18=3+(18-1)3
=3+(17)3
=3+51
=54