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\( a^{b}\)

\( a_{b}^{c}\)

\({a_{b}}^{c}\)

\(a_{b}\)

\(\sqrt{a}\)

\(\sqrt[b]{a}\)

\(\frac{a}{b}\)

\(\cfrac{a}{b}\)

\(+\)

\(-\)

\(\times\)

\(\div\)

\(\pm\)

\(\cdot\)

\(\amalg\)

\(\ast\)

\(\barwedge\)

\(\bigcirc\)

\(\bigodot\)

\(\bigoplus\)

\(\bigotimes\)

\(\bigsqcup\)

\(\bigstar\)

\(\bigtriangledown\)

\(\bigtriangleup\)

\(\blacklozenge\)

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\(\blacktriangle\)

\(\blacktriangledown\)

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\(\diamond\)

\(\dotplus\)

\(\lozenge\)

\(\mp\)

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\(= \)

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\(\frown \)

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\(| \)

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\(\ll \)

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\(\subseteqq \)

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\(\supseteq \)

\(\supseteqq \)

\(\emptyset\)

\(\mathbb{N}\)

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\(\mathbb{Q}\)

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\(\alpha\)

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\((a)\)

\([a]\)

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\(\bigcup_{b}^{} a\)

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\(\prod_{b}^{} a\)

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\(\int_{a}^{b}{c}\)

\(\iint_{a}^{b}{c}\)

\(\iiint_{a}^{b}{c}\)

\(\oint{a}\)

\(\oint_{b}^{} a\)

If 2 biros and 3 pencil is #18

Note a pencil is #2.5

Therefore 3 pencil will be

3 × 2.5 = 7.5

Subtract the total amount of pencil from 18

18 - 7.5 = 10.5 as the amount for the 2 biros

Now how much is a biro

Remember

2biro = #10.5

1biro = #x

Cross multiply

x# = #5.25. That's it

Well done