How many strings of 5 digits have the property that the sum of their digits is 7 ?
A. | 66 |
B. | 330 |
C. | 495 |
D. | 99 |
Option: B Explanation : Click on Discuss to view users comments. Mohamedsohel Shaikh said: (4:09pm on Thursday 2nd July 2015)
This answer is written with the following assumptions1. any digit can be ≥ = 02. more that one digit can have same valueRequired number of strings = the number of non-negative integer solutions of equation x1 x2 x3 x4 x5=7The number of non-negative integer solutions of equation x1 x2 ... xn = r is (n r-1)CrHence, the answer is (5 7-1)C7 = 11C7 = 330Answer:-B
balraje ksagar said: (1:55pm on Friday 3rd July 2015)
Answer is 330
dawider said: (3:28pm on Monday 27th July 2015)
How? What is c means(5 7-1)c7
dawinder said: (3:29pm on Monday 27th July 2015)
What is c value and why
kokz said: (3:00am on Saturday 12th September 2015)
what is meant by 11c7=330 how is this
Nismon Rio said: (9:06pm on Thursday 19th November 2015)
@Kokz 11c7 means find the factorial equation of this..11x10x9x8x7x6x5 / 1 x 2 x 3 x 4 x 5 x 6 x 7.. simplify this equation. u ll get 330
janakiraman said: (6:04am on Wednesday 22nd November 2017)
Factorial methods are using solve the problem
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A. | 22 / 36 |
B. | 12 / 36 |
C. | 14 / 36 |
D. | 6 / 36 |
Option: C Explanation : Click on Discuss to view users comments. Jayant Solanki said: (9:52am on Friday 3rd July 2015)
how explaing please.
balraje ksagar said: (1:55pm on Friday 3rd July 2015)
14/36
Madhavi said: (6:30pm on Friday 4th September 2015)
its 14/36
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A. | 1001 |
B. | 3876 |
C. | 775 |
D. | 200 |
Option: A Explanation : Click on Discuss to view users comments. shyamveer said: (10:23am on Tuesday 25th August 2015)
how?
Mohd shaliyar said: (11:59pm on Friday 4th September 2015)
B is the answer because (n r-1)C(r-1) where n= 15 and r=5 when we put this we get 3876.
Deepanjali said: (1:45pm on Tuesday 7th February 2017)
what is C?and what is its value.
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Consider the following statements-
A. | (a) and (b) |
B. | (c) and (d) |
C. | (a) , (b) and (c) |
D. | (a), (b) , (c) and (d) |
Option: D Explanation : Click on Discuss to view users comments. |
A. | (a) and (b) |
B. | (b) and (c) |
C. | (a) and (c) |
D. | (a), (b) and (c) |
Option: D Explanation : Click on Discuss to view users comments. |