Question

If the first term of an AP is 2
and the common difference is
(-1)/2, what would be the 12th
term of the AP? *​

Answer 1

Answer:

21

Step-by-step explanation:

The first term is -1

Common difference is 2

so 12 th term is

a+(n-1) d

= -1+11*2

=-1+22

=21

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Answer 2

Answer:

-7/2 or -3.5

Step-by-step explanation:

We know that,

a = 2

d = (-1/2)

also, a(nth) = a + (n-1)d

so by substituting the values we get

a(12th) = 2 + ((12-1)×(-1/2))

= 2 + (-11/2)

= 4/2 - 11/2

= -7/2 = -3.5

And to check it we can form the A.P

A.P = 2, 1.5, 1, 0.5, 0, -0.5, -1, -1.5, -2, -2.5, -3, -3.5,........

so you can see that the 12th term is -3.5

Hope you understood it.......All the best.