Mrs Nicholas is buying Christmas presents for her 5 children to give to one another. If each child gives a present to each of the others, how many presents must she buy?
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Mrs. Nicholas will give 4 present to each of her child, so that they can give present to one another , since there are 5 children so total 20 nos of present will be bought by Mrs. Nicholas.
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The mouthpiece helps to amplify the buzzing of the lips, which creates the sound. Most brass instruments have valves attached to their long pipes; the valves look like buttons. ... You change the pitch and sound by pressing different valves and buzzing your lips harder or softer.
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