Question

Which term of the A. P. 84,80,76.... is zero

Answer 1

We know that Tn = a + (n-1)d 

                             = 84 + (n-1) *(-4) = 0

                             = 84 - 4n + 4 = 0

                            = 88 - 4n = 0

                            n = 88/4

                               = 22



Hope this helps!

Answer 2

Answer:

22nd term

Step-by-step explanation:

The arithmetic sequence is given as

84,80,76....

We have

a = 84

d = 80-84 = -4

We have to find the term which is zero in the A.P. i.e. $a_n=0$

General form of an A.P. is given by

$a_n=a+(n-1)d$

Substituting the known values, we get

$0=84+(n-1)(-4)\\\\0=84-4n+4\\\\4n=88\\\\n=22$

Hence, 22nd term of the given A.P. is zero.