SSC Government Jobs Exams Logical Reasoning General Mental Ability

A concave lens of focal length f form an image
which in n times the size of the object. The
distance of the object from the lens is

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SSC Other Question
In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?

Options
1) 1
2) 126
3) 63
4) 64 In how many different ways can the letters of the word 'OPTICAL' be arranged so that the vowels always come together?

Options
1) 610
2) 720
3) 825
4) 920