Question

find the 27th term of the A.P -5,-5/2,0,5/2

Answer 1

a=-5

d=-5/2-(-5)

=-5/2+5

=5/2

an=a+(n-1)d5/2

a27=-5+(27-1)5/2

=-5+26(5)/2

=-10+180/2

=170/2

=85

Answer 2

Answer: 65

Step-by-step explanation:

a=1st term, d=common difference

N=a+(n-1)d

a= -5 and d=-5/2 - -5 = +5/2

=-5+(n-1) x 5/2

=-5 +5/2n +5/2

=5/2n - 5/2

Put "n" =27

=5/2 x 27 - 5/2

= 65

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