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Which term of the AP 3,15,27,39.....will be 120 more than its 21st term |
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Answer» a=3d=15-3 =12A21 = a+20d =3+20×12 =3+240 =243An=243+120 =363An=a+(n-1)d363=3+(n-1)12363-3=12n-12360+12=12n372=12n372/12=n31=n Ans=31 31 st term |
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