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| 1. |
If 8th term of an AP is 0. Prove that its 20th term is thrice its 12th term |
| Answer» a8=0 then a+7d=0, so a=-7d. >(1)To prove a20=3(a12)a+19d=3(a+11d)Put a=-7dAns.will come 12d=12d | |