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Arundeep
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DIVISIBILITY BY SEVENTEEN : Negative osculator for 17 is 5 (see note). The working for this is the same as in the case of 7.Ex 1 : Check the divisibility of 1904 by 17. Soln : 190 4 : 190 - 5x4 = 170 Since 170 is divisible by 17, the given number is also divisible by 17. Note : Students are suggested not to go upto the last calculation. Whenever yoti find the number divisible by the given number on right side of your calculation stop further calculation and conclude the result. Ex 2 : 957508 95750 8 : 95750- 5x8 = 95710 9571 0 : 9571 -5x0 =9571 957 1 : 957 - 5x1 = 952 95 2 : 95 - 5x2 = 85 Since 85 is divisible by 17, the given number is divisible by 17. Ex 3: 8971563 897156 3 : 897156- 5x3 = 897141 89714 1 : 89714 - 5x1 = 89709 8970 9 : 8970 - 5x9 = 8925 892 5 : 892 - 5x5 = 867 86 7 : 86 - 5x7 = 51 Since 51 is divisible by 17, the given number is also divisible by 17. |