find the sum to n terms of each of the series ?( answer fast plzzz)
1×2+2×3+3×4+4×5+.....
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infinity is the answer of this question
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sfhJdhhhfnjhynsfhfshmjhukkufsukthkufxktuumkdtjdkjdgmjxguthdmdgjkdutmdgjmnbnbbbbAnswer is 5
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