The factors of 49 are: 1 7 49
The prime factors are: 7 x 7
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The common factors are: 1, 3
There is only one prime number which is even and that is 2 and prime number rule applies for only positive numbers. so we have 2000 and u can arrange 2000 in 4! ways but digit there are 3 '0's so the answer is 4!/3! and there 4 such numbers less than 10000 which ad upto 2.
Well, honey, first things first, you group the terms with common variables together. So, you have (Ab - ad) + (CD - cb). Then, you factor out the common factors from each group. That gives you A(b - d) + C(D - b). Voila! That's your factored expression.
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Madonna