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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: P & C
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[Post New]24 May 2007 22:21:37 IST
    Subject: P & C
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prateek.agarwal (307)

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5. The tens digit of 1! + 2! + 3! + 4! ?. 49!  is
 
(a) 1
(b) 2
(c) 3
(d) 4
 
Answer: A
    
[Post New]24 May 2007 22:25:36 IST
    Subject: P & C
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naveen_nvn (108)

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the tens digit of all ...10!, 11!, ....49! is zero...
so the required answer is just tens digit of 1!+2!+...+9!
now these factorial r easy result and u can add these 2 find the sum 2 b 409113...i.e, the tens digit 2 b..1
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[Post New]24 May 2007 22:28:59 IST
    Subject: P & C
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prateek.agarwal (307)

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hey thnx naveen...really fast man...
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[Post New]24 May 2007 22:36:35 IST
    Subject: P & C
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naveen_nvn (108)

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anytime...yw :)
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[Post New]26 May 2007 22:51:00 IST
    Subject: P & C
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dssriram50 (164)

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vry nice method naveen..
if u have failed,dont be dissapointed,coz uve learnt one way how u cant succeed..n never stop tryin..coz perseverence pays!!
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