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1-1-4-1-1-9-1-1-16-1-1-25-




Question Number 147453 by EDWIN88 last updated on 21/Jul/21
 (1−(1/4))(1−(1/9))(1−(1/(16)))(1−(1/(25)))...=?
$$\:\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{4}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{9}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{16}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{25}}\right)…=? \\ $$
Commented by gsk2684 last updated on 21/Jul/21
 (1−(1/4))(1−(1/9))(1−(1/(16)))(1−(1/(25)))...=?  (1−(1/2))(1+(1/2))(1−(1/3))(1+(1/3))(1−(1/4))(1+(1/4))...  (1/2) (3/2) (2/3) (4/3) (3/4) (5/4) ...  (1/2)
$$\:\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{4}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{9}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{16}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{25}}\right)…=? \\ $$$$\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{2}}\right)\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{2}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{3}}\right)\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{3}}\right)\left(\mathrm{1}−\frac{\mathrm{1}}{\mathrm{4}}\right)\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{4}}\right)… \\ $$$$\frac{\mathrm{1}}{\mathrm{2}}\:\frac{\mathrm{3}}{\mathrm{2}}\:\frac{\mathrm{2}}{\mathrm{3}}\:\frac{\mathrm{4}}{\mathrm{3}}\:\frac{\mathrm{3}}{\mathrm{4}}\:\frac{\mathrm{5}}{\mathrm{4}}\:… \\ $$$$\frac{\mathrm{1}}{\mathrm{2}} \\ $$
Commented by puissant last updated on 21/Jul/21
nice sir gsk..
$${nice}\:{sir}\:{gsk}.. \\ $$
Answered by liberty last updated on 21/Jul/21

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