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If the average marks of 17 students in a class is A. The marks of the students when arranged in either an ascending or a descending order was found to be in arithmetic progression. The class teacher found that the students who were ranked 3rd, 7th, 8th, 11th, 15th had copied in the exam and hence got all of them rusticated. The average of the remainder of the class was B. Then

Read the following text and answer the following questions on the basis of the same : In a school, a Design exam is conducted in class x . Rubina wins 1^(st) prize. She made a square embroidery handkerchief with 9 circular thread designs on it Find the total area of 9 circles if radius of each circle is 7 cm

Read the following text and answer the following questions on the basis of the same : In a school, a Design exam is conducted in class x . Rubina wins 1^(st) prize. She made a square embroidery handkerchief with 9 circular thread designs on it On a square handkerchief, nine circular designs each of radius 7 cm are made (see in figure) . Find the circumference of one of the circular design

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Below there is a conversation between a teacher and student of class 3rd on the topic Air Teacher:What will happen if there is unclean or polluted air in the whole world Student I:Ma'am will not get proper oxygen to breathe in StudentII:There will be no animals ,insectes etc Teacher:So what we will do? Student III:Ma'am for fresh air we have to plant more or more trees and stop using personal vehicle for traveling this interaction shows that students are good in

The probability that a teacher will conduct an unannounced test during any class meeting is 1/4 . If a student of the class is absent twice, then the probability for the student to miss at least one test is (A) 3/16 (B) 6/16 (C) 1/16 (D) 7/16