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NEN HAB IS U LURSULULVE uuu natural numb...

NEN HAB IS U LURSULULVE uuu natural numbers, both or WHICH elde less than 40 SECTION -C 27. Prove that: 1+2+3+... + OR 28. Prove that: x -y is divisible by x+y. 29. In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students: (a) were taking either tea or coffee? (b) were taking neither tea nor coffee? 30. If sin 20 = 3cos , where sos2n, then find the value of 8. OR on Prove that: (a) (sin 3x + sin x) sin x+cos3x - cos x) cos x = 0 (b) 2cos cos + cos + cosm=0 ? 31. (a) Given A = {1,2,3,4,5), 5={[X,Y: € A. Y EA). Find the ordered pairs which satisfy the conditions given below: (l) x + y = 5 (i) x+y<5 (b) Solve the inequalities: 6 S-3 (2x-4) < 12 32. A manufacturer has 600 litres of a 12% solution of acid. How many litres of a 30% acid solution must be

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In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee ?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?