1.what is the probability that a random;y selected positive

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1.what is the probability that a random;y selected positive divisor of 2 100(2的一百次方) is a divisor of 2 50(2的五十次方）?Note that for any positive integer N,both 1 and N are divisors of N.Express your answer as a common fraction.
2.How many of the integers in the interval fron 1 to 40 have exactly 4 (positive) divisors?
3.Two 1x1 squares partically overlap as shown.What is the area of the region of overlap?Express your answer in simplest radical form.
4.How many integers between 100 and 999 are there whose "hundreds" digit is equal to the sum of the other two digits?
5.How many positive integers are there none of whose digits is 0 and the sum of whose digits is
6.The numbers in the set (1,2,3,4,5,6,7) are divided into two groups.Let "a" be the product of the numbers in one group,and let "b" be the product of the numbers in the other group.What is the smallest possible value of a+b?
实在打不动了.要是网上也有copy就好了,天杀的老师

分数太少只写答案,全过程50分以上
1,1/101
2,15
3,没图没法算,as shown,在那里show呢
4,54
5,16
6 144
再问：第一题有个12年级朋友告诉我是51/101- -
再答：哦我看错了。。。是51/101
再问：额。。。好吧。。。我加分好了。。。
再答：

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