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Which term of the AP 3,15,27,39.....will …

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Which term of the AP 3,15,27,39.....will be 120 more than its 21st term

Posted by Ankul Prajapati 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Chirag Jain 6 years, 10 months ago

a=3 d=15-3 =12 A21 = a+20d =3+20×12 =3+240 =243 An=243+120 =363 An=a+(n-1)d 363=3+(n-1)12 363-3=12n-12 360+12=12n 372=12n 372/12=n 31=n Ans=31

3Thank You

Raj Kumar 6 years, 10 months ago

31 st term

0Thank You

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