Self
Maths Puzzle
Numerical Ability
Sequence and Series
Find the missing term denoted by ?
2,11,31,73,?
Read Solution (Total 4)
-
- 2=1^3+1=1^3+1!
11=3^2+2=3^2+2!
31=5^2+6=5^2+3!
73=7^2+24=7^2+4!
series is of form (n^2+m!) where n=1,3,5,7,9(series of odd no.)
& m=1,2,3,4,5 (series of natural no.)
so next no. is
9^2+5!=81+120=201
ans 201 - 10 years agoHelpfull: Yes(2) No(0)
- 2=1^2+1=1^2+1!
11=3^2+2=3^2+2!
31=5^2+6=5^2+3!
73=7^2+24=7^2+4!
series is of form (n^2+m!) where n=1,3,5,7,9(series of odd no.)
& m=1,2,3,4,5 (series of natural no.)
so next no. is
9^2+5!=81+120=201
ans 201 - 10 years agoHelpfull: Yes(2) No(0)
- 2*2+7=11
11*2+9=31
31*2+11=73
73*2+13=159 - 10 years agoHelpfull: Yes(1) No(0)
- difference of consecutive numbers
11-2=9
31-11=20
73-31=42
now calculate difference of differences
20-9=11
42-20=12
so, 42+13=55
now 55+73=128
so ans is 128
orignal series:- 2 .... 11... 31... 73..... 128
difference series:- 9.....20....42....55
difference series2:- 11....12...13
- 10 years agoHelpfull: Yes(0) No(0)
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