2019_Qn A73,How many triplets (x, y, z) satisfy the equation x + y + z = 6, where x, CSAT Solution

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How many triplets (x, y, z) satisfy the equation x + y + z = 6, where x, y and z are natural numbers?
(a) 4
(b) 5
(c) 9
(d) 10
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Why subtract the number one from n and r

TheMark
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Sir kindly solve any examples of permutations and combinations by formulae, I can't properly do it 🙏🙏🙏🙏🙏🙏🙏🙏

zindadil