this is done using integral solution method..
let x - no. of single steps
let y - no of double steps
x + 2y = 22
x = 22 - 2y
the possible values of y for x >= 0
y = 0,1,2,3,4,5,6,7,8,9,10,11
hence no.of integral solutions is 12
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Ankur Khetrapal
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