\(S=2+2^2+2^3+.....+2^{100}\)
\(2S=2^2+2^3+2^4+.....+2^{101}\)
\(2S-S=\left(2^2+2^3+2^4+.....+2^{101}\right)-\left(2+2^2+2^3+....+2^{100}\right)\)
\(S=2^{101}-2\)
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S = 2 + 2 ^ 2 + 2 ^ 3 + ... + 2 ^ 100
2S = 2 ^ 2 + 2 ^ 3 + 2 ^ 4 + ... + 2 ^ 101
2S - S = ( 2 ^ 2 + 2 ^ 3 + 2 ^ 4 + ... + 2 ^ 101 )
- ( 2 + 2 ^ 2 + 2 ^ 3 + ... + 2 ^ 100 )
S = 2 ^ 101 - 2
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S= 2+22+23+...+2100
2S= 2.(2+22+23+...+2100)
2S= 22+23+24+...+2101
2S-S= (22+23+24+...+2101)-(2+22+23+...+2100)
S= 2101-2
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