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Explain pls. How to make 4 people sit in a row of 11 people such that no two sit together

what is the hcf of 5.2 ,13 ,39 , my ans is 1.3 but somewhere ans is given 2.6

IF AB+XY=1XP.WHERE A IS NOT EQUAL TO 0, AND EACH ALPHABET SIGNIFY DIFFERENT DIGIT FROM 0-9.THEN THE VALUE OF A is?

THE  MEAN OF 1,2,2^2.............2^31 LIES IN BETWEEN

In a school, there are 5 teachers. A and B teach Agriculture, Chemistry and Botany. D and A teach Management and Agriculture. E and B teach Psychology and Chinese. C teaches Chemistry and Botany.

What are the subjects​ each teacher teaches?

how to solve equation (x+t)=4(y-t)and(x-t)=3(y+t)

Please provide solution with logic.

A person covers half his journey by train at 60kmph the remainder half  by bus at 30 kmph and the rest by cycle at 10 kmph.find his average speed during the entire journey

in how many ways can 4 people be seated in 11 chairs such that no two of them sit together

Question no 50. Please provide me the solution of it .