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Let tr=2^(r/2)+2^(-r/2) then sum(r=1)^10...

Let `t_r=2^(r/2)+2^(-r/2)` then `sum_(r=1)^10 t_r^2=`

A

`(2^(21)-1)/(2^(10))+20`

B

`(2^(21)-1)/(2^(10))+19`

C

`(2^(21)-1)/20-1`

D

none of these

Text Solution

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The correct Answer is:
B
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FIITJEE-PROGRESSION & SERIES -ASSIGNMENT PROBLEMS (OBJECTIVE) LEVEL-I
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