First, apply Euclid’s lemma to 867 and 255: 867 = 255 × 3 + 102. Then, 255 = 102 × 2 + 51. Finally, 102 = 51 × 2 + 0, so HCF is 51. Kintu didi, exam er tension nishchoy chai na – amio toh protidin maths er formula pore, ar baba dekhen ma er chai er dokaner kharcha-apaar hisaab koren, dujoner e calculation e jibon!
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