MCQ
The mean of first five prime numbers is:
- A3
- B3.6
- C7
- D7
Solution:
The first five prime numbers are 2, 3, 5, 7, 11
$\text{Mean}=\frac{\text{sum of the terms}}{\text{no. of terms}}$
$\text{Mean}=\frac{2+3+5+7+11}{5}$
$=\frac{28}{5}=5.6$
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Given the integers r > 1, n > 2, and coefficients of (3r)th and (r + 2)nd terms in the binomial expansion of (1 + x)2n are equal, then:
$6\tan\beta$