Algebra - Last digit

1

skygirl ·2009-03-10 00:07:19

is d ans 9 ??

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13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-03-10 00:09:54

dunno ...the ans ..may b u r rite....

plz teach me....how to do these....

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1

skygirl ·2009-03-10 00:13:55

how i did:

(2130 + 7)⁷⁵⁴

= 7⁷⁵⁴ + 10m

now 7x7=49
x7 = 343
x7 =(...)1 .. i mean last digit 1

so it repets after every 4th poewers.

but 754 is not a multiple of 4 and its two less ... dat means last digit shud be 9.

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62

Lokesh Verma ·2009-03-10 00:14:49

2137⁷⁵⁴

last digit is same as

7⁷⁵⁴ (Is it obvious?)

Now 7^2 = 49... last digit is (-1)

Now 7^4 = xxxkljxl .. last digit is (-1)^2 =1

7⁷⁵² has last digit 1

multipy by 49 last digit is 9

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1

skygirl ·2009-03-10 00:19:58

hmm... mereko ek doubt yaad aya!

find last three digits of (17)²⁵⁶.

plz hlp in this one.

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Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-03-10 00:32:20

all that i have learnt is to find the last digit....which is 1 [3]

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62

Lokesh Verma ·2009-03-10 00:38:25

yes I thinkthat part is very stupid..findinglast 2 - 3digits..

I dont see a goodmethod.

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1

sindhu br ·2009-03-10 00:39:42

even i got it as 9 ................

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Lokesh Verma ·2009-03-10 00:40:28

good work sindhu :)

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