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The sum `1+3+7+15+31+...to100`terms is`2^(100)-102 b`b. `2^(99)-101`c. `2^(101)-102`d. none of theseA. `2^(100)-102`B. `2^(99)-101`C. `2^(101)-102`D. none of these |
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Answer» Correct Answer - C Here the successive differences are 2,4,8,16,… which are in G.P. `S=1+3+7+15+31+…+T_(100)` `=(2^(1)-1)+(2^(2)-1)+(2^(3)-1)+..+(2^(100)-1)` `=(2+2^(2)+2^(3)+….+2^(100))-100` `=2((2^(100)-1)/(2-1))-100` `=2^(101)-102` |
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