99 - 97 + 95 - 93 + 91 - 89 + ... + 7 - 5 + 3 - 1
= (99 - 97) + (95 - 93) + ... + (7 - 5) + (3 - 1) = 25 x 2 = 50
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S = 99 – 97 + 95 – 93 + 91 – 89 + ….+11 – 9 + 7 – 5 + 3 – 1S = 99 – 97 + 95 – 93 + 91 – 89 + ….+11 – 9 + 7 – 5 + 3 – 1
99−97+95−93+91−89+⋯+7−5+3−1
99-97+95-93+91-89+......+7-5+3-1
99-97+95-93+91-89+.......+7-5+3-1
99-97+95-93+91-89+...+7-5+3-1
99-97+95-93+91-89+.....+7-5+3-1 = ?
99-97+95-93+91-89+...+7-5+3-1= ?
99-97+95-93+91-89+......+7-5+3-1= ?
99-97+95-93+91-89+....+7-5+3-1 = ?
99 – 97 + 95 – 93 + 91 – 89 + ... + 7 – 5 + 3 – 1