Here the series is:
987654321, 87654321, 7654321, 65...
According to Nitin, Nidhi's birthday falls on Wednesday or Thursday ---------(i)
According to Dheeraj , Nidhi's birthday falls on Thursday or Friday ---------(ii)
From (i) and (ii), Nidhi's birthday falls on Thursday.
Second, fourth and the sixth digits of the number are 3, 1 and 6. Using these digits only once we can make 361, which is a perfect square number. Hence, our answer is 19 x 19 = 361
Given Number : 7 6 5 3 4 2 1 8
New Number : 8 7 6 4 5 3 2 9
Ascending Order : 2 3 4 5 6 7 8 9
Fifth digit in the above ascending order arrangement is '6' . Hence option(1) is the correct answer.
As from the given conditions;
Order is
N O P Q R S T
Here the student standing in the middle is 'Q'.
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