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Question
55 × 5–5 = ______.
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Solution
55 × 5–5 = 1.
Explanation:
Using law of exponents,
am × an = (a)m + n ...[∵ a is non-zero integer]
∴ 55 × 5–5 = (5)5 – 5
= (5)0
= 1 ...[∵ a0 = 1]
Hence, 55 × 5–5 = 1
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