WB Police Constable 2021 Solved Paper

Question : 3 of 100

Marks: +1, -0

In the series of numbers below, how many times are 1, 3 and 7 together where 7 is in the middle and 1 and 3 are on either side of it?
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