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How many digits are in 28 × 510 When written out completely ?

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answer is B.

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Detailed Solution

⇒ 28 × 510 (Given)
⇒ 28 ×58 ×52 (Written as)
⇒ (2×5)8 × 25 (am × bm) + (a.2)m
⇒ 25×108
⇒ 2500000000
∴ there are tota 10 digits

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