Latest MBA Aptitude Question SOLUTION: How many three-digit positive integers have their hundreds, tens and units digits in ascending order?

1) 70
2) 77
3) 84
4) 504

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(#M40015042) MBA question number systems, progressions Keep an EYE

How many three-digit positive integers have their hundreds, tens and units digits in ascending order?

1) 70
2) 77
3) 84
4) 504

Asked In MBA (11 years ago)

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MANEMMA  (6 years ago)

ans:100-200--->123-129 total(7)
-->134-139(6)
--->145-149(5)
--->156-159(4)
-->167-169(3)
--->178-179(2)
-->189(1)
if we add 7+6+5+4+3+2+1=28
like this if we continue up to 999
then we get
28+21+15+10+6+3+1=84
so ans:84

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