Math, asked by Anonymous, 1 year ago

Find 20th term of AP 9 , 13 , 17 , 21

Answers

Answered by Thevillain
8
HOLA

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First term = 9

Common difference = 4

Tn = A + ( N - 1 ) D

T20 = 9 + ( 20n - 1 ) 4

T20 = 9 + ( 80n - 4 ) ==> 76 + 9 = 85

T20 = 85

Hence the 20th term of AP is 85

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