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
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
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