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বাংলাদেশ অর্থনৈতিক অঞ্চল কর্তৃপক্ষ (সহকারী ব্যবস্থাপক) 25-09-2020 || 2020

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If A is a multiple of 5, then a is a multiple of 10.
If A is not a multiple of 5, then a is not a multiple of 10.
A necessary condition for A to be a multiple of 10 is that A is a multiple of 5.
A is multiple of 10 implies that a is a multiple of 5.