Question

दि A = 21+2j+pk तथा B = 21-j+k परस्पर लग्बवत हों तो p का मान ज्ञात कीजिए।
अथवा​

Answer 1

Answer:

Let a=2i−j+k,b=i+2j−k and c=i+j−2k be three vectors. A vector in the plane of b and c whose projection on a is of magnitude

3

2

is