5 without using 1 = 5
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y2 * y-5 = y2 / y5 = 1/y3
290... without using a calculator !
It can be done by: (9-5) times 6 times 1 = 24
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You can do 99+1 or (2*5)2
Divide both sides by -5 x = -2
Possible 5 digit combinations using 5 digits only 1 time is 5! or 5*4*3*2*1 or 120. Using 5 digits where numbers can be used 5 times is 55 or 3125.
527,519 = 500,000 + 20,000 + 500 + 10 + 9 5 4 2 1 ( 5 times 10 ) + ( 2 times 10 ) + ( 5 times 10 ) + (1 times 10 ) + 0 ( 9 times 10 ) 5 times 1,000,000 + 2 times 10,000 + 1 times 10 + 9 times 1
1, 3, 5, 9, 15, 45 -1, -3, -5, -9, -15, -45
It is: 3^2 times 5^2 times 7^1 = 1575