All numbers that end in 1 are prime numbers.? true or counterexample

False. As a counterexample, you can choose 21, which is 3*7

To generate other counterexamples, you can play with multiples of 3: we know that the sum of their digits is a multiple of 3.

So, for example, you may pick a number composed only by one 1, one 5 and as many zeroes as you like. So, numbers like 51, 501, 5001, 50001, 5000001, etc, will all be divisible by 3, because the sum of their digits is 6.

Similarly, you may compose numbers with three ones and as many zeroes as you like: numbers like 111, 1011, 11000001, 1000000001000001, etc, will all be divisible by 3, because the sum of their digits is 3.

i need more info. are you looked to see there mph? how much they deliver? how far they go?

step-by-step explanation:

step-by-step explanation:

a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 2 times the age of the child?

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this needs to be the answer format, or else your answer is incomplete.

if the number of years is x, then the equation is

in __ years