# Number System - Questions & Discussions

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Hello people, As the earlier number system thread had more than 10k replies,we have closed the old one and presenting to you a part 2 of the same :: Please continue with the discussions of Number system problems here,henceforth. H...
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Anyone?

@shubham_prasad Ans fo QNo 25 is 1. You can click on the link for the detailed solution.[img] https://i.imgur.com/Tjo3Qvb.jpg[/img]

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@Simi4  ·  6 karma

Thanks

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last non zero digit of 40 factorial

1
2
8
none of these

Q 33 please with the procedure.

@charitha_1  ·  0 karma

Sum of all the digits is divisible by 9.

(7*5)+(8+9+1+1+1)*10+1+2=738.

It is divisible by 9 leaving remainder zero.

@Subhas_Nandy  ·  0 karma

I am getting 3 as the answer. Summation from 75 to 79 = 35 + (7*5). From 80 to 89 = (1+2+..,+9)+(8*10) = 45+80. Similarly, for 90 to 99 = (1+2+...+9)+(9*10). For 100 to 109 = (1+2+...+9)+(1*10). For 110 to 120, it is (10+11+12+...+20)+(1*11). The total sum when divided by 9 leaves a remainder 3.

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Which is best portal to enhance your vocab ?

@ChahatKapoor  ·  144 karma

@pratiksahoo33 I hate reading newspapers. and no time for novels. That is the issue. !

@yashchawla  ·  532 karma

learn roots ..they really help in judging the meaning

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Which Take home simcats are the toughest? I am finding the earlier ones(101 to 108) pretty easy..

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@Amarrajput17  ·  2 karma

use options

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The number of factors of N=2^3 x 3^5 x 5^7 which have more than four factors, is?

180
179
182
183

Product of factors of a number is 576^2. Find the sum of the factors of the number

Solution?

60
24
7
100

5^8 & 8^5 , which one is greater nd how

@mayur_aroraIIM Bangalore  ·  9,273 karma

@grawat 5^8 & 8^5

=  5^8 & 2^15

= 8log5 & 15log2

= 8*0.7 & 15*0.3

= 5.6 & 4.5

Compare for these two.

Hence 5^8 is greater.

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@zippysoul  ·  1,238 karma

@grawat remember this handy rule: in between a^b and b^a, the one with the higher exponent is greater (for a, b>3)

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