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

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

Posted by Shubham Yadav❤❤ 6 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Shubham Yadav❤❤ 6 years, 1 month ago

Hlw

1Thank You

Manish Kumar 6 years, 1 month ago

a=3 d=12 n=21 an=? an=a + (n-1)d = 3+ 20d =3 + 20*12 = 3+240 an =243 An= an+ 120 = 243+120 =363 An= a+(n-1)d 363= 3+(n-1)12 363-3=(n-1)12 360/12=n-1 30=n-1 n =30+1 n =31

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