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- Try to express numbers in base $7$.
- You can think of it in terms of expansion of (1+x). Then apply combinatorial logic in terms of the power of $x$.
ভাগশেষ নির্ণয়
${89}\choose{78}$ কে $7$ দ্বারা ভাগ করা হলে ভাগশেষ কত হবে?
[এখানে, $\binom{89}{78}={}^{89}C_{78}$]
Combinatorics
Divisibility
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