Question

if the first term of an ap is -4 and its 12th term is18 then its common difference is

Answer 1

Answer:d=2

Step-by-step explanation:

Here a=-4

t12=18

To find: d=?

We know, tn=a+(n-1)d

Therefore, tn=a+(12-1)d

Or 18= -4+11d

Or, 18+4=11d

Or,22=11d

Therefore d=22/11=2