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How many $4$-digit palindromes are divisible by $3$? How many $4$-digit palindromes are divisible by $3$? I'm trying to figure this one out I know that if a number is divisible by $3$, then the sum of its digits is divisible by $3$ All I have done
matrices - When will $AB=BA$? - Mathematics Stack Exchange You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
Matrices - Conditions for $AB+BA=0$ - Mathematics Stack Exchange You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
prove $\\Gamma(a)\\Gamma(b) = \\Gamma(a+b)B(a,b)$ using polar . . . You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
How to calculate total combinations for AABB and ABBB sets? Although both belong to a much broad combination of N=2 and n=4 (AAAA, ABBA, BBBB ), where order matters and repetition is allowed, both can be rearranged in different ways: First one: AABB, BBAA,
$A^2=AB+BA$. Prove that $\det (AB-BA)=0$ [duplicate] You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later