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Question 65

Let $$S_1 = \sum_{j=1}^{10} j(j-1)\,^{10}C_j$$, $$S_2 = \sum_{j=1}^{10} j\,^{10}C_j$$ and $$S_3 = \sum_{j=1}^{10} j^2\,^{10}C_j$$. Statement-1: $$S_3 = 55 \times 2^9$$. Statement-2: $$S_1 = 90 \times 2^8$$ and $$S_2 = 10 \times 2^8$$.

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