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its pretty hard which class I will include answer again
3) Square root of 480249 is 639
6 ans: classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.
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use the Google the answer is so big
divisibility of 3 = sum of all digits
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solve solve question wait for sometime
How many such 3-digit numbers are there?
Let the number be 100x + 10y + z, where x, y and z are single digit numbers and x > 0.
Now the reverse number shall be 100z + 10 y + x. Now it is given that both of them are divisible by 7 and hence their difference shall also be divisible by 7.
Thus (100x + 10y + z) – (100z + 10 y + x) = 7m, where m is an integer.
This implies that 99(x – z) = 7m.
Now since 99 is not divisible by 7 therefore x-z should be divisible by 7. Again since x and z are single digit numbers their difference which is divisible by 7 would actually be 7 only, because for no value of x or z shall x-z be equal to 14 or 21 or 28 etc.
Thus we have x – z = 7 and the values that x and z can take are (9,2) and (8, 1)
Thus the numbers are of the form 1_8 and 2_9.
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