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Value of `(1+1/3)(1+1/(3^2))(1+1/(3^4))(1+1/(3^8))oo`is equal to`3`b. `6/5`c. `3/2`d. none of theseA. 3B. `6/5`C. `3/2`D. none of these |
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Answer» Correct Answer - C Consider the first product, `P=(1+1/3)(1+1/3^(2))(1+1/3^(4))(1+1/3^(8))..(1+1/(3^(2^(n))))` `=((1+1/3)(1+1/3^(2))(1+1/3^(4))(1+1/3^(8))...(1+1/3^(2^(n))))/((1-1/3))` `=((1+1/3^(2))(1+1/3^(2))(1+1/3^(4))(1+1/3^(8))...(1+1/3^(2^(n))))/((1-1/3))` `=((1+1/3^(4))(1+1/3^(4))(1+1/3^(8))...(1+1/3^(2^(n))))/((1-1/3))` `1/((1-1/3))(1-(1/3)^(2^(n-1)))` `=3/2(1-(1/3)^(2^(n+1)))` `rArr(1+1/3)(1+1/3^(2))(1+1/3^(4))(1+1/3^(8))...` infinity `=lim_(ntoo)3/2(1-(1/3)^(2^(n+1)))=3/2` |
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