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X,y,z are odd no not necessarily in sequence then y=?
1) mean of x and z is 114
2)mean of y and z =113

plz explain in detail ans is 115

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how many combination is possible by using 1, 2, 3, 4, 5 to make a sum of 50 using there number; There are 4 addressed envelopes the letters are placed at random at random the prob that not all 4 letters are placed in correct envelope

ans me in detail plzzz