The arithmetic mean of a group of 20 observations was calculated as 12.5. It was later found that one observation was wrongly read as -15 instead of 15. Then the correct mean is
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If x = 2 $\sqrt{6}$+5, then the value of x+$\dfrac{1}{x}$ is |
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In a problem on division, dividend is 1261, Divisor is half the quotient, remainder is 11. Then the divisor is |
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If x+1 is a factor of ax$^{4}$ + bx$^{3}$+ cx$^{2}$ + dx + e, then which one of the following is true? |
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$(px + q)^{3}$ –$ (px - q)^{3}$= |
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Three metallic cubes of sides 3cm, 4 cm and 5cm respectively are melted and are recast into a single cube. Then the lateral surface area |
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A ladder 25 m long reaches a window of building 20 m above the ground. Then the distance of the foot of the ladder from the building is |
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$(64)^{x} = 2\sqrt{2}$, then the value of x is |
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A hollow sphere in which a circus motorcyclist performs his stunts, has an inner diameter of 7 metres. The area available to the motorcyclist for riding is (in Sqm) |
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1 sq decimetre is equal to |
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$\triangle$ ABC ~ $\triangle$ PQR; AB =3.6, PQ = 2.4 and PR = 5.4, then AC = |
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