उत तर: # एक x vec b = 8i + 2j + 5k # स पष ट करण: #vec a = - 1, -1,2 "" vec b = 1, -4,0 # #ve a x vec b = i (-1 * 0 + 4 * 2) -j (-1 * 0-2 * 1) + k (1 * 4 + 1 * 1) # # एक x vec b = 8i + 2j + 5k #