99-97+95-93+91-89+......+7-5+3-1
= (99-97) + (95-93) + (91-89) +...+ (7-5) + (3-1)
= 2 + 2 + 2 + ... + 2 + 2
= 2 x 25
= 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