JEE Main 202329 Jan, Evening shiftMathematicsMediumVector Algebra184× since 2002If a→=i^+2k^,b→=i^+j^+k^,c→=7i^−3j^+4k^,r→×b→+b→×c→=0→\overrightarrow a = \widehat i + 2\widehat k,\overrightarrow b = \widehat i + \widehat j + \widehat k,\overrightarrow c = 7\widehat i - 3\widehat j + 4\widehat k,\overrightarrow r \times \overrightarrow b + \overrightarrow b \times \overrightarrow c = \overrightarrow 0a=i+2k,b=i+j+k,c=7i−3j+4k,r×b+b×c=0 and r→ . a→=0\overrightarrow r \,.\,\overrightarrow a = 0r.a=0. Then r→ . c→\overrightarrow r \,.\,\overrightarrow cr.c is equal to :AOption A. 36BOption B. 30COption C. 34DOption D. 32CheckSkip · show solution
