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  1. When simplified the product
    1 −
    1
    1 −
    1
    1 −
    1
    ........ 1 −
    1
    345n

    it becomes :
    1. 1
      n
    2. 1
      n

    3. 2(n − 1)
      n
    4. 2
      n(n + 1)
Correct Option: B

1 −
1
1 −
1
1 −
1
........ 1 −
1
345n

=
2
×
3
×
4
×......×
n − 1
=
2
345nn

We observe that denominator of a term cancels with the numerator of the succeeding term



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