a,b,c are odd positive integers,then number of integral solutions of a+b+c=13 is
a,b,c are odd positive integers,then number of integral solutions of a+b+c=13 is
zehna narmin , 8 Years ago
Grade 11
Magical Mathematics[Interesting Approach]> a,b,c are odd positive integers,then numb...
2 Answers
Arun
Let
a = 2x +1
b = 2y +1
c = 2z +1
Now
2(x+y+z) = 10
x + y+ z = 5
Now
x, y, z can start from 0
Now
x. y z
0. 0. 5. = 3 ways
0. 1. 4. = 6 ways
0. 2. 3. = 6 ways
1. 1. 3. = 3 ways
1. 2. 2. = 3 ways
Hence total possible numbers are 21
Karthik
The mean deviation about -2and2are18 and 10 respectivly. The standared deviation of this set of observations is
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