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Ritabrata Gautam
  • Member for 8 years, 10 months
  • Last seen more than 1 year ago
  • Kolkata, India
14 votes
3 answers
28k views

Distributing $n$ different things among $r$ distinct groups such that all of them must get atleast $1$

6 votes
1 answer
2k views

Distributing $n$ different things among $r$ persons

4 votes
1 answer
98 views

issues with simple algebraic equations

4 votes
4 answers
11k views

how to find nth term in a fibonacci series or sum of a series of fibonacci numbers

3 votes
3 answers
1k views

time speed distance

3 votes
2 answers
1k views

Probability of getting 50 heads is equal to the probability of getting 51 heads

2 votes
1 answer
6k views

Time and Work: pipe and cistern related problem

2 votes
1 answer
248 views

probability of a function f(x) to be increasing

1 vote
4 answers
106 views

issues with probability

1 vote
2 answers
349 views

combinatorics and divisibilty

1 vote
3 answers
84 views

issues with geometry triangle

0 votes
1 answer
66 views

combinatorics and geometry

0 votes
1 answer
309 views

combinatorics :: selecting from variety of groups

0 votes
1 answer
2k views

tank and pipes problem

0 votes
1 answer
104 views

Combinations of two letters from a $124$-element alphabet

0 votes
1 answer
866 views

Geometry - finding the area of the triangle inside a rectangle

-1 votes
2 answers
2k views

how to find nth term of different fibonacci series with golden ratio [duplicate]