Rahul wanted to type of first $180$ natural numbers fix the number of times he hads to press numbered keys

384

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432

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416

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448

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Solution

The correct option is D $432$
Upto 180
$1 - 9 \to 9 (1 - D i g i t) 10 - 99 \to 90 (2 - D i g i t) 100 - 180 \to 81 (3 - D i g i t)$

Hence, total numbers pressed $= 9 * 1 + 90 * 2 + 81 * 3 = 432$

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Rahul wanted to type of first 180 natural numbers fix the number of times he hads to press numbered keys

The correct option is D 432Upto 1801−9→9(1−Digit)10−99→90(2−Digit)100−180→81(3−Digit)Hence, total numbers pressed =9∗1+90∗2+81∗3=432

Rahul wanted to type of first $180$ natural numbers fix the number of times he hads to press numbered keys

The correct option is D $432$
Upto 180
$1 - 9 \to 9 (1 - D i g i t) 10 - 99 \to 90 (2 - D i g i t) 100 - 180 \to 81 (3 - D i g i t)$

Hence, total numbers pressed $= 9 * 1 + 90 * 2 + 81 * 3 = 432$