Question

Find the middle term of an ap6,13,20,.....216

Answer 1

an=216

a=6

d=13-6

 =7

an=a+(n-1)d

216=6+(n-1)7

216=6+7n-7

216=6+7n-7

216=-1=7n

217=7n

n=217/7

n=31

middle term=1/2*(n+1)

=1/2*(31+1)

=1/2*32

=32/2

=16

Middle Term is 16

a16=a+(n-1)d

     =6+(15-1)(7)

      =6+(14)(7)

      =6+98

      =114

a16=144

i hope this helps you!!

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