solve it......
mental maths
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See the pic for figure.
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We are Given :-
1st place = 6
2nd place = 126
3rd place = 5
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We have to find 4th place.
For it,
In 1st and 2nd
6 and 126
means,
We have formula :-
n = n*2 + (term of n)
____________________
Put n = 5
We get,
5(2) + (n th term)
105
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•°• 4th place is 105
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