In the following series of numbers, find out how many times, 1, 3 and 7 have appeared together, 7 being in the middle and 1 and 3 on either side of 7 ?
2  9  7  3  1  7  3  7  7  1  3  3  1  7  3  8  5  7  1  3  7  7  1  7  3  9  0  6

A. 3

If the first and second digits in the sequence 5 9 8 1 3 2 7 4 3 8 are interchanged, also the third and fourth digits, the fifth and sixth digits and so on, which digit would be the seventh counting to your left ?

D. 8

The letters L, M, N, O, P, Q, R, S and T in  their order are substituted by nine intergers 1 to 9 but not in that order. 4 is assigned to P. The difference between P and T is 5. The difference between N and T is 3. What is the integer assigned to N ?

C. 6

In the series,
6  4  1  2  2  8  7  4  2  1  5  3  8  6  2  1  7  1  4  1  3  2  8  6
How many pairs of alternate numbers have a difference of 2 ?

B. TWO

Sangeeta remembers that her father`s birthday was certainly after eighth but before thirteenth of December. Her sister Natasha remembers that their father`s birthday was definitely after ninth but before fourteenth of December. On which date of December was their father`s birthday ?

D. DATA INADEQUATE