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Earn +20 ptsQ: How many 9 digit numbers using 1-9 once are prime?
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How many two digit prime numbers are there?
There are 21 two-digit prime numbers.
How many three digit numbers have odd prime number as 1st digit A prime number as 2nd digit and an odd number as 3rd digit?
There are 17 such numbers.
How many 4 digit numbers are all made of prime numbers?
24 of them.
How many two-digit prime numbers have four as one of their digits?
there are 4
How many two digit prime numbers are there between 1-100 such that they have digit 7 in their units place?
There are 5 of them.
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