91 = 13*7
70 = 7*5*2
28 = 7 * 2 *2
hcf is product of smallest power of all common factor
from here 7 is hcf because it is common in all
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91 = 13*7
70 = 7*5*2
28 = 7 * 2 *2
hcf is product of smallest power of all common factor
from here 7 is hcf because it is common in all