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    				| 1. | `lambda ` का मान ज्ञात कीजिए यदि सदिश `2hati -hatj +hatk ,hati+2hatj -hatk ` तथा ` 3hati +lambdahatj +5hatk ` एक समतलीय है| | 
| Answer» माना `oversetto A=2hati -hatj +hatk ` ` oversetto B =hati +2hatj -hatk ` `oversetto C =3hati +lambda hatj +5hatk ` सदिश `oversetto A,oversetto B,oversetto C` एक समतलीय होंगे यदि `[oversetto Aoversetto B oversetto C ]=0` अब `[vecA vec B vecC]=|{:(2,-1,1),(1,2,-1),(3,lambda,5):}|=0` ` rArr " " 2(10 +lambda )+ 1(5+3) + 1(lambda -6 )=0 ` ` " "20 + 2lambda +8+lambda -6=0` ` " "3lambda +22=0` ` " "lalmbda =-(22)/(3)` | |