3 years ago

How many 4 digit palindromes contain both the digits 1 and 2

Mathematics

1 answer:

Norma-Jean [14]3 years ago

8 0

What a clever sneaky little problem !

There can only be two of them: 1221 and 2112 .

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Dmitry [639]

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3 years ago

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seraphim [82]

Answer:

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3 years ago

What is 1 1/4÷ by 3 4/5

spin [16.1K]

let's firstly convert the mixed fractions to improper fractions and then divide.

$\bf \stackrel{mixed}{1\frac{1}{4}}\implies \cfrac{1\cdot 4+1}{4}\implies \stackrel{improper}{\cfrac{5}{4}}~\hfill \stackrel{mixed}{3\frac{4}{5}}\implies \cfrac{3\cdot 5+4}{5}\implies \stackrel{improper}{\cfrac{19}{5}} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{5}{4}\div\cfrac{19}{5}\implies \cfrac{5}{4}\cdot \cfrac{5}{19}\implies \cfrac{25}{76}$