Sir, we always use to take consecutive integer as n, n+1 n+2—-n+N. But in this we had took n,”n-1″
Take two consecutive numbers 56, 57.
The Larger number, say 57 as “n” so how can you write 56, as “n-1”.
If you have three consecutive numbers, then you can take it as n-1, n and n+1.
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