1 থেকে 70 পর্যন্ত সংখ্যা গুলির মধ্যে কতগুলি সংখ্যার একক এর অঙ্কে 1 অথবা 9 থাকবে তার শতকরা হার নির্ণয় করো?
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20% numbers from 1 to 70 have 1 or 9 in the unit's digit. 1,9,11,19,21,29,31,39,41,49,51,59,61,69 this is that series of numbers . These are total 14 numbers out of 70 so 14/70×100 gives us 20 % occurrence of 1 or 9 at unit place
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