Question

The 15th term of the AP-5/2,0
5/2,... is
(a) -30
(c) 30
(b) 20
(d) -20​

Answer 1

Answer:i think it is non of it

Step-by-step explanation:

we know that  an=a1+(n-1)d

d=a2-a1

i.e 0-(-5/2)=5/2

⇒ a15= -5/2+(15-1)*5/2

         = -5/2+14*5/2

here 14 cancles by 2

then,   = -5/2+35

           = (-5+70)/2

            = 65/2