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# m16#36

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Math Expert
Joined: 02 Sep 2009
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Re: m16#36 [#permalink]

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05 May 2014, 02:01
daboo343 wrote:
OA is wrong
C is the right ans
because on subtracting 16 from 10^20, we have only 19 nos left.
17 are 9 and last two are 8 and 4.
so sum= 17*9+8+4=165

As explained in the post above the OA is correct.

Check similar questions to practice here: m16-75444.html#p1357907
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Re: m16#36 [#permalink]

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27 May 2014, 20:45
harshavmrg wrote:
zz0vlb wrote:
10-6 always gives 4 in the units place ..the only answer choice that has 4 in the units place is D.

i liked the way u have answered mate....no need of calculation, but just keen observation.. +1 to u

well, the above shortcut just gives the last digit of the number obtained after subtraction and not the last digit of the sum of digits of the number obtained after subtraction.
Its just a coincidence that the last digit of the number after subtraction and the sum of digits of the number after subtraction was same in this case.
Re: m16#36   [#permalink] 27 May 2014, 20:45

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# m16#36

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