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 Oct 11 comment How many ways balls can be selected? Ok @Brian. Thanks for your time and help. Oct 11 comment How many ways balls can be selected? Is this question can be solved by the same method? math.stackexchange.com/questions/207069/… Oct 11 comment How many ways balls can be selected? Is this question can be solved by the same method? Oct 11 comment How many ways balls can be selected? Thanks I understood the problem .I hope spending a little time in this question will make me solve this type of problem later. Oct 11 accepted How many ways balls can be selected? Oct 10 comment How many ways balls can be selected? you are right but i am getting difficulty in understanding your answer .It may be because i am not that good in PnC . Coming back to the question Is it similar to the question when we are asked number of non negative integral solution of x1+x2 + ..+ xn = S and each Xi >= 0 . If yes can you explain me in that terms. Oct 10 asked How many ways balls can be selected? Oct 9 comment Need help to find remainder when $5!25!$ is divided by $31$? @yunone Here the answer is -1 or 1 ? Since after solving it comes (-1)^5!25! Oct 9 revised Find the remainder when $10^{400}$ is divided by 199? edited body Oct 9 accepted Find the remainder when $10^{400}$ is divided by 199? Oct 9 asked Find the remainder when $10^{400}$ is divided by 199? Oct 4 accepted How many ways he can attempt the paper? Oct 4 comment How many ways he can attempt the paper? @can you tell me another way of solving it. Oct 4 revised How many ways he can attempt the paper? added 2 characters in body; edited tags Oct 4 asked How many ways he can attempt the paper? Sep 22 accepted What is the remainder when $4^{100}$ is divided by 6? Sep 22 comment What is the remainder when $4^{100}$ is divided by 6? But $4^{100}/6$ is equal to $2^{200}/6$ . Sep 22 comment What is the remainder when $4^{100}$ is divided by 6? Geoff : I am not able to get you. I have added a proof of 2nd argument .Can you tell me where i am wrong? Sep 22 revised What is the remainder when $4^{100}$ is divided by 6? added 247 characters in body Sep 22 asked What is the remainder when $4^{100}$ is divided by 6?