Question 1 of 20
1,3,9,31,?,651
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Answer:
nth term =( (n-1)th term * (n-1)) + (n)
1st term = 1,
2nd term = (1*1) + 2=3;
3rd term = (3*2)+3=9;
4th term= (9*3)+4=31;
5th term=(31*4)+5=129;
6th term=(129*5)+6=651
Thus 651 is the answer. :-)
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