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(ii)
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Q. (ii)
- Calculate Cubes: Calculate the cubes of each number from to and alternate the signs starting with positive for ., , , ..., , ).
- Sum Series with Signs: Sum the series with alternating signs: . The series alternates between adding and subtracting the cubes of consecutive integers.
- Use Sum Formula: Use the formula for the sum of cubes of the first natural numbers: . For odd , the sum is positive, and for even , the sum is negative. Sum = .
