From all the English alphabets five letters are chosen

Question 11: From all the English alphabets five letters are chosen and are arranged in alphabetical order. The total number of ways, in which the middle letter is ‘M’, is : (1) 14950              (2) 6084 (3) 4356                (4) 5148        … Read more

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If ∑Tr = (2n-1)(2n+1)(2n+3)(2n+5)/64 then

If ∑Tr = (2n-1)(2n+1)(2n+3)(2n+5)/64 then  Question 10:-  If , then is equal to (i) 1                     (ii) 0 (iii) 2/3                (iv) 1/3                                      … Read more

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A coin is tossed three times Let X denote the number

Question 6:- A coin is tossed three times. Let X denote the number of times a tail follows a head. If μ and σ² denote the mean and variance of X, then the value of 64(μ + σ²) is : (i)  51                 (ii)  48 (iii) 32          … Read more

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