what is ten plus fifteen

what is ten plus fifteen


It should be 25



Four out of six equals two out of fifteen plus a few


First question
4/6=2/3
So four out of six is two out of three
Second question
4/6=2/3=10/15=2/15＋8/15
So 4 out of 6 is 2 out of 15 plus 8 out of 15



What is 1 / 3 plus 1 / 15 plus 1 / 35 plus 1 / 63
Please write the formula;
Let's talk about it again (if we can)
thank you


1/3+1/15+1/35+1/63
=(1-1/3)/2+(1/3-1/5)/2+(1/5-1/7)/2+(17/-1/9)/2
=(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9)/2
=(1-1/9)/2
=4/9

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