Fight with Eight
By
KT Rajagopalan
The question:
Prof Math E W is at it again. He tells the class: ‘You can make 6! = 6*5*4*3*2*1 = 720 six-digit numbers using each of the digits between 1 and 6 inclusively exactly one time each.’
He asks them for a few examples.
Anil calls out ‘123456 itself!’ Priya says, ‘346125’ while Siddharth says, ‘112345’ and all others cry out, ‘No, it is not such a number: 1 is repeated and 6 is not used at all!’
‘Okay, my question is: How many of these 6-digit numbers are divisible by 8?’
Anil, Shreya, Priya and Siddharth come up with the answers: 120, 72, 90 and 84 respectively.
Who is right, if at all? (a) Anil (b) Shreya (c) Priya (d) Siddharth (e) None
Would you like a hint?
1
|
View Posts 
Testimonial
Dear Wadehra Bhai,
You have done 79ers proud. While congratulating you on this occasion let me say that by tagging ourselves (79ers)with you as a fellow 79er, we too have become "smart scholars". Smart way of snatching some credit you say?
Puzzle # 14 Fight with Eight
