Question

Find the first positive term for an A.P -51,-48,-45,-42

Answer 1

Answer:

3

Step-by-step explanation:

In an AP

a=-51

d=a2-a1=-48-(-51)

-48+51=3

now, If you go on seeing the multiples of 3 greater than 51 so that the negative sign will get cancelled and a positive term you will get

this implies

you know the formula to find the nth term of an AP

an=a+(n-1)*d

an=-51+(19-1)*3

=-51+18*3

=+3