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R1 = (2i 4j 10k)
R2 = (6i 8j 3k)
R1 * R2 = 2i *6i , 4j * 8j, 10k * 3k
= 12i + 32j + 30k
= 70
cuman bisa nom itu doang ahaha.. gak apa apa ya :)