For a number greater than 10 to be prime, what may be the possible digits in the units' place?
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if the units place has 0,2,4,6,8, then the number will be even number, so have 2 as a factor. so, won't be prime.
5 can also not be in the units place as then, the number would have 5 as a factor. so, it won't be prime.
it can have any of the other digits in the units place.
eg-11,13,17,19 are prime nos>10 having 1,3,7,9 respectively in units place.
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