Question

What is the value of

A.
512

B.
64

C.
16

D.
8

Answer 1

you have to find out cube root here. what are you not getting? how to split it?

Answer 2

Hint.. check out the last digit of the numbers after raising their power to 3..

for instance.. 2^3 = 2 * 2 * 2 = 8..

Answer`s last digit will match with last digit of given problem..

Answer 3

Like 8^3 .. (8 is selected from given options)

8 * 8 * 8 = x4 * 8 = xx2
where, 2 is the last digit.. and in given problem last digit is 6.. so 8 is not the answer..

Answer 4

ok but what im not getting is where do you get the 8*8*8 from like what would be the number for my question?

Answer 5

so to start with basic u may split it as 2*something then again and with practice u will get hang of it slowly...

Answer 6

started with 2 as its an even number.... or u may start with 4 also as 4*4=16 and last digit here is 6..... so u may go with prime factorisation method... u know this method?

Answer 7

select from options... 8 , 16, 64 and 512

Answer 8

suppose its 64=2*2*2*2*2*2 ... now u see 2 appears 6 times... so while taking cube root we get 2 .. 2 times... means its 4...

Answer 9

Here as options are given u can go ahead with options also.... starting from least one to make task easier..

Answer 10

a simpler way to add on vedic`s point.. 64 ^3 = 64 * 64 * 64

multiply last digit of 1st two terms.. 64 * 64 = xx6 ..( as 4 * 4 = 16)
now continue.. xx6 * 64 = xxx4 ... ( as 6 * 4 = 24).. again last digit..

Answer 11

so 512

Answer 12

how u arrived at 512?

Answer 13

it was just a rough estimate

Answer 14

your rough estimate was totally wrong.... just think if u multiply 512 three time would u get a four digit number???

Answer 15

ohhhhhh so its between 64 and 16

Answer 16

yup.... but now see 4*4*4=64... so last digit would be 4 if we cube 64.... so now we r left with 16.... as 6*6*6= 216.. so last digit 6... so 16 ..