Question
In ∆ABC, AB = 5cm, BC = 10cm, and AC = 13cm then find
out the value of cos A.Solution
From the Cosine rule, we get. BC2 = AC2 + AB2 - 2AC.AB.cos A 100=25+169-2×5×13×Cos A 130CosA=194-100=94 cos A = 94/130 =47/65
At a round table, n persons are seated on n chairs. The probability that two friends from same college are sitting next to each other, is:
The deseasonalised time - series data will have only trend (T), cyclical (C) and irregular (I) components and is expressed as:
The grouped data for the observation are as follows.
Class : 2-4 4-6 6-8<...
These seventh decile (D7) of data set 4, 3, 10, 9, 1 is
The coefficient of correlation is the _________ of coefficients of regression.
Five persons A, B, C, D and E occupy seats in a row at random. The probability that A and B sit next to each other is:
Which option is WRONG?
Which option is incorrect for the component of ti.me series.
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