સદીશ ${\rm{2\hat i}}\,\, + \;\,{\rm{2\hat j}}\,\,{\rm{ - }}\,\,{\rm{2\hat k}}\,{\rm{,}}\,\,{\rm{5\hat i}}\,\, + \;\,{\rm{y\hat j}}\,\, + \,{\rm{\hat k}}\,$ અને $\,{\rm{ - \hat i}}\,\, + \;\,{\rm{2\hat j}}\,\, + \;\,{\rm{2\hat k}}$ એ એક જ સમતલમાં સદીશો છે તો $y$ નું મૂલ્ય . .. . . છે .
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