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प्रश्न
Find the value of p + 2q + 3r, when p = 1, q = 5 and r = 2
बेरीज
उत्तर
p + 2q + 3r
= 1 + 2 × 5 + 3 × 2
= 1 + 10 + 6
= 17
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Concept of Substitution
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