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$N = 1 0^{25} - 7$ . What is the sum of the digits of $N$ ?

Competition practiceNumber System, HCF & LCM

A219
B225
C216
D207

Step-by-Step Solution

1 0^{25} - 7

is written as twenty-four 9s followed by a 3 (like 1000 − 7 = 993). Digit sum =

24 \times 9 + 3 = 219

.

Answer: A) 219

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