Question
Which one of the following numbers is divisible by 11?
Solution
The given number can only be completely divided by 11 if the difference between the sum of digits at the odd position and the sum of digits at the even position in a number is 0 or 11. 1987645 1+8+6+5=20 9+7+4=20 =20-20=0.
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Rod of which of the following metal is used in nuclear reactors to slow down the speed of the neutrons?
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I. They have different atomic numbers
II. The have same mass numbers
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Which type of bond is formed by the sharing of electrons?
