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| 1. |
Three numbers are in A.P . if the sum of these numbers be 27 and the product 648 . find the numbers |
| Answer» (a-d)+a+(a+d)=3a=27, a=9, (a-d) a (a+d)=(9-d) 9 (9+d)=648,(81-9d)(9+d)=648,729+81d-81d-9d2=648,729-648=9 d2, 81/9=d2, d2=9, d=3 .... now a=9, d=3,..required number. 6,9,12 | |