reasoning type

(A):22225555+55552222 is divisible by 7.
(R):xn-an is divisible by x-a,n is even or odd and xn+an is divisible by x+a if n is odd.

answer is A.............jus tell me how is reason explainin the assertion part??

10 Answers

1
Akand ·

wow awesum question archana...................cant find a clue..............hw d heck shud v start????

1
archana anand ·

no idea dude.........i m .blank[7]

1
MATRIX ·

hehe.........akand........she is a genius as in her pic..............

1
archana anand ·

hehe......gini pig i m ...not genius.....wud have solved this question if i were.......

1
kamalendu ghosh ·

answer is A

1
MATRIX ·

ya kamal............she alreadyy told that itz A but she is asking for the explanation..dude tell the explanation .........

1
dimensions (dimentime) ·


now,

2222 ≡ 3(mod7)
5555 ≡ 4(mod7)

it can be written as

(22225555+45555)+(55552222 - 42222)+(42222 - 45555)

22225555+45555 is divisible by 7 as 5555 is odd and 2226(=2222+4) is divisible by7

similarly

55552222 - 42222 is divisible by 7 as 5551 (5555-4) is divisible by7

now , 45555=10241111

and 42222 = 161111
now,

1024(mod7) = 16(mod7) = 2

therefore,

10241111(mod7) = 161111(mod7) = 23(370)+1(mod7) = 2

so we have,

45555 = 7m+2 and

42222 = 7n+2 (for some m,n belongs to integers)

so (42222 - 45555) = 7(n-m) = 7p

so we have

(22225555+45555)+(55552222 - 42222)+(42222 - 45555) is divisible by 7

and statement 2 correctly explains statement 1

1
archana anand ·

thanx alot .......[1]

62
Lokesh Verma ·

This first one arjit asked me the day he was here :)

I hope you got the solution above :)

1
archana anand ·

oh he did.?......lolz....i asked him....bt he din kno

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