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Logical Reasoning
Number Series
The sum of odd number between 20 and 30 is
a) 105
b) 120
c) 125
d) 140
e) 145
Read Solution (Total 5)
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- 125 is correct ans
21+23+25+27+29= 125 - 8 years agoHelpfull: Yes(4) No(0)
- Those numbers are in arithmetic progression
So n/2(a+l)
Where n=5 ;a=21;l=29 - 7 years agoHelpfull: Yes(0) No(0)
- n/2[2a+(n-1)*d]
here a=21,n=5,d=2
- 7 years agoHelpfull: Yes(0) No(0)
- c, easily add them
- 7 years agoHelpfull: Yes(0) No(0)
- Between 20 and 30
odd numbers - 21+23+25+27+29 = 125
answer is (c) - 7 years agoHelpfull: Yes(0) No(0)
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