Question

Which term of ap 21,18,15.......is 276

Answer 1

Answer:

answer is = (-84)

Step-by-step explanation:

a= 21, d= 18-21= -3, an= 276

To find= n

= an = a + (n-1)d

= 276 = 21 + (n-1) (-3)

= 276 - 21 = (n-1)(-3)

= 255/(-3) = n-1

= - 85 = n-1

= 1 - 85 =n

=n= (-84)