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प्रश्न
Find the sum:
(–7) + (–9) + 4 + 16
योग
उत्तर
(–7) + (–9) + 4 + 16
= (–7) + (–9) + 4 + (+7) + (+9)
= (–7) + (+7) + (–9) + (+9) + 4
= 0 + 0 + 4 ...[∵ (–a) + (+a) = 0]
= 4
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