MBA Exam

hw many nos btw 1 and 500 can be expressed as a diff of square of at least one way????please post the approach

1) 125
2) 250
3) 126
4) 100

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MBA Other Question

find the last 2 digits of 7^1 + 7^2 +.....+7^342please post the approach

1) 42
2) 56
3) 99
4) 01
In how many ways can 3 couples sit around a circular table such that no pair of wife and husband are opposite to each other Solution bhi batado.. jaise circular ayega mera gadi panchar

1) 64
2) 60
3) 100
4) 96