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Please tell me with step-by-step it's urgent |
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Answer» all you need is to do prime FACTORISATION of the given numbers.To prime factorise, you must have in mind, divisibility rules of some basic integers.for ready reference, I ENUMERATE a fewDivisibility by 2 : If rightmost digit (digit at one PLACE) is any one of 0,2,4,6,8 then the number will be divisible by 2Divisibility by 5 : If the rightmost digit of a number is 0 or 5, the number is divisible by 5Divisibility by 3: If sum of the digits of a number is divisible by 3, the number is divisible by 3Now, a) 156255. |. 15625 5 |. 3125 5 |. 625 5 |. 125 5 |. 255. |. 5. |. 1. hence, 15625 = 5*5*5*5*5*5since 5 OCCURS six times in this multiplication series15625 = 5^6b) 2197I see that the number is divisible by 1313 |. 2197--------------13 | 169-------------13 |. 13------------- 1thus 2197 = 13*13*13or, 2197 = 13^3try the last one yourself, you can do it |
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