how many two-digit primes have a ones digit of 1????????????????????

Question

got no clue

Answer 1

mmmh, let's see, the 2 digits primes would be
11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,91,97

and the ones with a 1 in the units digit....?

Answer 2

i feel stupid thank you =]

Answer 3

My intention was in no way to make you feel that way.

It just seemed like an obvious way to answer the question.

Answer 4

My intention was in no way to make you feel that way too.

i felt stupid to not get the question and it was easy

and i thanked u for helping

Answer 5

All the 2 digit primes are 11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,91,97

So the ones with a ones digit of one would be
11, 31, 41, 61, 71, 91

that is 6 numbers.

I'm so late

Answer 6

Actually my first answer was incorrect! 91 is not a prime number, sorry.
So the answer to the question would be 11, 31, 41, 61, 71 which is 5

Answer 7

To answer this question, we instead count the number of primes among the 9 two-digit positive integers whose ones digit is 1. These primes are 11, 31, 41, 61, and 71. Therefore, 5 two-digit primes have a ones digit of 1.