IBM
Company
Numerical Ability
Number System
The sum of even numbers between 1 and 31 is:
A. 6 B. 28
C. 240 D. 512
Read Solution (Total 2)
-
- 11 is repeated between the numbers
therefore the next number will be 11
the pattern will bw 11,22,23,11,24,25,11,26,27,11.....and so on... - 12 years agoHelpfull: Yes(12) No(0)
- tn=a+(n-1)d
30=2+(n-1)2
=>n=15
Sum of n terms=n/2*(firstterm+lasterm)
15/2*(2+30)=240 - 9 years agoHelpfull: Yes(3) No(0)
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