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Which term of AP 3,15,27,39.......is 120 …

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Which term of AP 3,15,27,39.......is 120 more than its 53rd term?

Posted by Amit Verma 5 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Ashok Jadhav 5 years, 11 months ago

a=3,d=12,an=53 an= a+(n-1)d an53=3+(52)×12 =3+624=627 Now add 120. 627+120= 747 747=a+(n-1)d 747= 3+(n-1)12 747-3=(n-1)12 744/12=(n-1) 62 =n-1 n=62+1=63 term

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