NTSE Government Jobs Exams

1 + 2 + 3 + 4+ 5 + 6 + 7 + 8 + 9 =

Read Solution (Total 6)

1 + 2 + 3 + 4+ 5 + 6 + 7 + 8 + 9 = 45
12 years agoHelpfull: Yes(5) No(1)

sum of 'n' natural number n(n+1)/2=9*10/2=45
12 years agoHelpfull: Yes(4) No(2)
sum = (9/2)*(1+9) = 10*9/2=45
12 years agoHelpfull: Yes(2) No(2)
1+9=10
2+8=10
3+7=10
4+6=10
sum = 10+10+10+10+5 = 45
12 years agoHelpfull: Yes(0) No(1)
add smallest and largest number 1+9=10
subtract smallest and biggest number. 9-1=8
add 1 to the result obtained in step 2. 8+1=9
multiply step 1 and step 3. 10*9=90
divide it by 2 90/2= 45
10 years agoHelpfull: Yes(0) No(0)
sum = (9/2)*(1+9) = 10*9/2=45
9 years agoHelpfull: Yes(0) No(0)

NTSE Other Question

Twenty-seven identical white cubes are assembled into a single cube, the outside of which is painted black. The cube is then disassembled and the smaller cubes thoroughly shuffled in a bag. A blindfolded man (who cannot feel the paint) reassembles the pieces into a cube. What is the probability that the outside of this cube is completely black? A person invested 3 times as much money at 5% as he had invested at 2% per annum simple interest. Further he invested Rs 6000 more at 3% than he had invested at 2%. If the total interest from the three investments after a year is Rs 980, then what is the total amount he invested?