Elitmus
Exam
Numerical Ability
Number System
A sequence of natural number 2,3,5,6,10............. such that no square and no cube occurs in the term.find the 300th term of sequence.
option dont remenber.
Read Solution (Total 7)
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- From 1 to 300 natural numbers 300 would have been the 300th natural number.
Now we removed squares between 1 to 300 which will be 1, 4, 9, 16 till 289 so total 17 numbers.
We then removed cubes from 1 to 300 1, 8, 27, 125, 216 5 cubes of which 1 and 64 are common. So in total, there are 21 numbers removed. So the 300th term would become 321 as there are no cubes or squares between 300 and 321. - 7 years agoHelpfull: Yes(29) No(5)
- ans is 321
- 7 years agoHelpfull: Yes(4) No(1)
- 1 to 300 = 300 numbers
squares btwn 1 to 300 = 1,4,9,16,25,36,49.....289 i.e, total 17
cubes = 1,8,27,64,125,216 i.e, 5
now 1 and 64 are common so total numbers that should be removed ( 17+5-2= 20 )
total 20 term removed so 300th term would be 320 - 7 years agoHelpfull: Yes(3) No(9)
- Squares 1 4 9 25 36 49 64 81 100 121 144 169 196 225 256 289 total 16 cubes 1 8. 27 64 125 216 total 6 overall 16+6 but 1 and 64 common counted 2 times each so 16+6-2 =20 so 300+ 20 = 320
- 7 years agoHelpfull: Yes(3) No(3)
- 1 to 300 = 300 numbers
squares btwn 1 to 300 = 1,4,9,16,25,36,49.....289 i.e, total 17
cubes = 1,8,27,64,125,216 i.e, 5
now 1 and 64 are common so total numbers that should be removed ( 17+5-2= 20 )
total 20 term removed so 300th term would be 320 - 7 years agoHelpfull: Yes(1) No(2)
- 320 correct
- 7 years agoHelpfull: Yes(0) No(6)
- 1 to 300 = 300 numbers
squares btwn 1 to 300 = 1,4,9,16,25,36,49.....289 i.e, total 17
cubes = 1,8,27,64,125,216 i.e, 5
now 1 and 64 are common so total numbers that should be removed ( 17+5-2= 20 )
total 20 term removed so 300th term would be 320 - 7 years agoHelpfull: Yes(0) No(5)
Elitmus Other Question
Dhoni ,Raina ,Kohli and Sikhar have all played 5 innings each and each scored 131 runs.The players ScoreCard is given below :
100,90,85,80,30,25,20,20,15,15,10,10,10,3,3,3,2,1,1,1.
Given hints are:
*Dhoni & Raina have scored different runs in 4 innings however in one innings they have scored same runs.
*Shikhar & Kohli have also scored different runs in 3 innings however their indivitual score is same throughout 2 innings(meaning each has scored same run twice in 2 innings).
*Raina's hiighest score is greater than that of Dhoni's highest score.
*Shikhar's highest score is greater than that of Kohli's highest score.
*Only Shikhar has scored more than 1 run in each innings.
Questions are :
1.Who scored century in one innings?
2.Who scored 30 runs in one innings?
3.Who scored 35 runs in 2 consucative innings?
4.Whose score has the highest multiple of 15 ?
5.Whose score has the highest multiple of 10?
perimeter of a regular hexagon ABCDEF is 42.find the area of ABDEF polygon
option are : a) 49
b)49 root 3
c) 36
d) 36 root3/2
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