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प्रश्न
Find the value of 2a + 4b + 5c, when a = 5, b = 10 and c = 20
योग
उत्तर
2a + 4b + 5c
= 2 × 5 + 4 × 10 + 5 × 20
= 10 + 40 + 100
= 150
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