#What is the last digit d of the 9-digit number 19700019d, given that the number is prime?

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ancient ermineBOT
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main rain
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where are you getting these from 😭

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anyways hint is to go through all the options and check them

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hint 2: ||check divisibility by 3, 5, and a secret third number||

naive light
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thank you a lot for these hints i get them from NUET Math Preparation document that is the a uvi's exem that i'll need to pass to enroll,

naive light
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okay i think the answer is 7 since 5 is divisible by 5, 3 and 9 divisible by 3 since 1+9+7+1+9+3\9 = 30\36m and 197000191 is divisible by 7

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thank you again

main rain
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~w 197000191 factorisation

light wingBOT
main rain
main rain
short geyserBOT
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@naive light

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