RRB 2013 Allahabad (2)

Question 55

Find the missing number in the series
1,4, ?, 4, 1

Solution

$$C_0^4 = 1$$
$$C_1^4 = 4$$
$$C_2^4 = 6$$
$$C_3^4 = 4$$
$$C_4^4 = 1$$

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