Sequences and Series
If the angle A,BandCof a triangle are in an arithmetic propression and if a,bandcdenote the lengths of the sides opposite to A,BandCrespectively, then the value of the expression casin2C+acsin2Ais21 (b) 23 (c) 1 (d) 3
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A student scored marks 46 % in English, 67 % in Maths, 53 % in Hindi, 72 % in History and 58 % in Economics. As compared to other subject weightage given to Mathematics, then find weightage mean marks of students.
The sum of n arithmetic means between a and b, is
Between two numbers whose sum is 12, an even number of A.M.s is inserted, the sum of these means exceeds their number by 20. Find the number of means.
the arethmetic mean of two positive numbers a and b is twice their GM then a:b is
The geometric mean of 6 and 54 is
In any ΔABC, Π(sinAsin2A+sinA+1) is always greater than
If a,b,c,d,e,f are A.M. ′s between 2 and 12, then find the sum: a+b+c+d+e+f.
The geometric mean between −9 and −16 is