find the 20th term of the last term of the AP 3 8 13-253 Question find the 20th term of the last term of the AP 3 8 13….253 in progress 0 Math Sarah 1 month 2021-08-12T13:42:08+00:00 2021-08-12T13:42:08+00:00 2 Answers 0 views 0

## Answers ( )

Answer:we have to find a20 so,

here a1= 3. d= 8-3=5

an=a +n-1(d)

253=8+n-1(5)

253-8=5n-5

245+5=5n

n=250÷5=

=50

so a20=a+19d

=3+19(5)

=98

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