{30C_0\cdot^{20}C_{10}+^{31}C_1\cdot^{19}C_{10}+^{32}C_2\cdot18C_{10}+ – InterviewSolution

1.	{30C_0\cdot^{20}C_{10}+^{31}C_1\cdot^{19}C_{10}+^{32}C_2\cdot18C_{10}+.}{+^{40}C_{10}\cdot^{10}C_{10} is equal to
Answer» {30C_0\cdot^{20}C_{10}+^{31}C_1\cdot^{19}C_{10}+^{32}C_2\cdot18C_{10}+.}{+^{40}C_{10}\cdot^{10}C_{10} is equal to

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