slove this question,there is an edit
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Step-by-step explanation:
r = 7 , n = 42
[n! / (n-1)! r! ] x = (n-1)! / (n-2)! (r-1)!
=> [(42)! / 41! * 7! ] x = 41!/ 40! * 6!
//we know that 42! = 42 * 41!
41! = 41 * 40!
7! = 7 * 6!
=> [42 * 41! / 41! * 7 * 6! ] x = 41 * 40! / 40! * 6!
//strike of 41! in numerator and denominator on left side as common
// similarly 40! on right side as common
=> 42x / 7 * 6! = 41/6!
//Strike of 6! on both sides as common terms from denominator
=> 42x / 7 = 41
=> 6x = 41
=> x = 41/6.
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