Question

Find the 21st term of AP -4*1/2,-3, -1*1/2​

Answer 1

Answer:

13/2

Step-by-step explanation:

d=-3-(-4*1/2)

=>-3-(-8+1/2)

-3-(-7/2)

-3+7/2

-6+7/2

1/2 so d= 1/2  

21st term = a+20d

=>-7/2+20(1/2)

=>-7/2+10

=>20-7/2

=>13/2