1
IIT-JEE 1992
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+2
-0
Let the harmonic mean and geometric mean of two positive numbers be the ratio 4 : 5. Then the two number are in the ratio .........
2
IIT-JEE 1988
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+2
-0
The sum of the first n terms of the series $${1^2} + {2.2^2} + {3^2} + {2.4^2} + {5^2} + {2.6^2} + .........$$ is
$$n\,\,{\left( {n + 1} \right)^2}/2,$$ when $$n$$ is even. When $$n$$ is odd, the sum is .............
3
IIT-JEE 1986
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+2
-0
The solution of the equation $$lo{g_7}$$ $$lo{g_5}$$ $$\left( {\sqrt {x + 5} + \sqrt x } \right) = 0$$ is .............
4
IIT-JEE 1984
Fill in the Blanks
+2
-0
The sum of integers from 1 to 100 that are divisible by 2 or 5 is ............
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