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20. A valid ISBN code consists of 10 digits like ISBNa1a2a3a4a5a6a7a8a9a10 such that 10.a1+9.a2+8a3+7a4+6a5+5a6+4a7+3a8+2a9+1a10 must be divisible by 11.
ISBN0111200091 is a valid code. Find the number of pairs of (a5, a9) other than (2, 9) such that the given ISBN is a valid code.

Read Solution (Total 2)

ISBN0111200091 produces the value 55
a5=2 and a9=9 will produce the sum = 6*2 + 2*9 =30

so we have to find such numbers which will produce 30

(a5,a9) pair of values will be (3,6) , (4,3) , (5,0 )
8 years agoHelpfull: Yes(1) No(0)

10
0,0
1,1
2,2
.
.
.
.
9,9
8 years agoHelpfull: Yes(0) No(2)

TCS Other Question

19. Two red dies and one blue die are rolled, what is the probability that the number on the blue die is greater than that of the other dies is?
a. 55/36
b. 55/216
c. 5/216
d. 5/36
21. A chess board of 10*10 is there. To change the color from black to white or vice versa “control+R” is used. Find the min number of times with which the entire board can be made in to a single color.