Question Number 552 by 123456 last updated on 25/Jan/15 $${proof}\:{that}\:\mathrm{log}_{\mathrm{2}} \mathrm{3}\:{is}\:{irrational} \\ $$ Answered by prakash jain last updated on 25/Jan/15 $$\mathrm{Let}\:\mathrm{us}\:\mathrm{say}\:\mathrm{log}_{\mathrm{2}} \mathrm{3}\:\mathrm{is}\:\mathrm{rational},\:\mathrm{then} \\ $$$$\mathrm{log}_{\mathrm{2}}…
Question Number 548 by 123456 last updated on 25/Jan/15 $${how}\:{many}\:{digits}\:{are}\:{in}\:{periodic}\:{part} \\ $$$${of}\:\frac{\mathrm{1}}{\mathrm{60}^{\mathrm{30}} } \\ $$ Answered by prakash jain last updated on 25/Jan/15 $$\frac{\mathrm{1}}{\left(\mathrm{60}\right)^{\mathrm{30}} }=\frac{\mathrm{1}}{\mathrm{2}^{\mathrm{30}}…
Question Number 518 by Yugi last updated on 25/Jan/15 $${Give}\:{the}\:{result}\:{of}\:{the}\:{following}\:{computation}\:{as}\:{an}\:{integer}\:{in}\:{the}\:{usual}\:{decimal} \\ $$$${form}.\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{303},\mathrm{000},\mathrm{000},\mathrm{000},\mathrm{303}×\mathrm{3},\mathrm{300},\mathrm{000},\mathrm{033}}{\mathrm{1},\mathrm{000},\mathrm{100},\mathrm{010},\mathrm{001}} \\ $$ Answered by prakash jain last updated on 22/Jan/15 $$\frac{\mathrm{303}\left(\mathrm{10}^{\mathrm{12}}…
Question Number 515 by 112358 last updated on 25/Jan/15 $${Find}\:{the}\:{smallest}\:{number}\:{greater} \\ $$$${than}\:{zero}\:{which}\:{can}\:{be}\:{written} \\ $$$${with}\:{ones}\:{and}\:{zeroes}\:{and}\:{is}\:{evenly}\:{divisble} \\ $$$${by}\:\mathrm{225}. \\ $$ Answered by prakash jain last updated on…
Question Number 514 by 112358 last updated on 25/Jan/15 $${Determine}\:{the}\:{smallest}\:{value}\:{of} \\ $$$${the}\:{form} \\ $$$${f}\left({u},{v}\right)=\frac{\mathrm{5}{v}^{\mathrm{2}} +\mathrm{5}{u}^{\mathrm{2}} +\mathrm{1}}{\mathrm{2}{u}+{v}} \\ $$$${where}\:{u},{v}\in{R}^{+} . \\ $$ Answered by prakash jain…
Question Number 513 by 112358 last updated on 25/Jan/15 $${What}\:{is}\:{the}\:{greatest}\:{common} \\ $$$${divisor}\:{of}\:{the}\:\mathrm{2010}\:{digit}\:{and}\:\mathrm{2005}\:{digit} \\ $$$${numbers}\:{below}? \\ $$$$\mathrm{222}…\mathrm{222}\:\left(\mathrm{2010}\:{of}\:{twos}\right) \\ $$$$\mathrm{777}…\mathrm{777}\:\left(\mathrm{2005}\:{of}\:{sevens}\right) \\ $$ Answered by prakash jain last…
Question Number 503 by 123456 last updated on 20/Jan/15 $${proof}\:{or}\:{given}\:{a}\:{counter}−{example}: \\ $$$${if}\:{n}\in\mathbb{N},{n}>\mathrm{1},\:{exist}\:{a}\:{number}\:{k}\in\mathbb{N} \\ $$$${k}\in\left(\mathrm{0},{n}\right]\:{such}\:{that}\:{n}+{k}\:{is}\:{prime}. \\ $$ Commented by prakash jain last updated on 20/Jan/15 $$\mathrm{Bertrand}'\mathrm{s}\:\mathrm{theorem}\:\mathrm{states}\:\mathrm{that}\:…
Question Number 475 by 123456 last updated on 25/Jan/15 $${proof}\:{or}\:{given}\:{a}\:{counter}\:{example}: \\ $$$${if}\:{p}\:{is}\:{prime}\:{and}\:{n}\in\mathbb{N},\mathrm{1}<{n}\leqslant{p} \\ $$$${then}\:{pn}−\mathrm{1}\:{is}\:{prime} \\ $$ Answered by prakash jain last updated on 11/Jan/15 $${p}=\mathrm{5}…
Question Number 471 by 123456 last updated on 25/Jan/15 $${proof}\:{or}\:{given}\:{a}\:{counter}\:{example}: \\ $$$${if}\:{n}^{\mathrm{2}} \:{is}\:{prime},\:{then}\:{n}\notin\mathbb{Z} \\ $$ Answered by prakash jain last updated on 10/Jan/15 $${n}^{\mathrm{2}} \:\mathrm{is}\:\mathrm{prime}\:\mathrm{so}\:{n}^{\mathrm{2}}…
Question Number 469 by 123456 last updated on 25/Jan/15 $${proof}\:{or}\:{given}\:{a}\:{counter}−{example} \\ $$$${if}\:{p}\:{is}\:{prime}\:{and}\:{a}\in\mathbb{N}\:{then} \\ $$$${p}\mid\left({a}+{p}\right)^{{p}} −{a}^{{p}} \\ $$ Answered by prakash jain last updated on 10/Jan/15…