General Aptitude Question:

what is the diode?

diode is a two terminal device. It allows current to flow only in one direction.

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10 years ago, the average age of a family of 4 members was 24 years. Tow children having been born (with age difference of 2 years), the present average age of the family is the same. The present age of the youngest child is:	Oshkosh did a study of the colors used in African national flags. He found that 38 flags have red, 20 have blue, 13 have both red and blue, and 8 have neither red nor blue. How many flags a. have red but not blue? b. have blue but not red? c. were included in the study?