How to solve IPMAT 2019 - Quantitative Aptitude Question 54?

This question can be solved by applying the core concept explained in the solution above, followed by step-by-step calculation and elimination of options.

Which concept is tested in this question?

This question tests fundamental concepts commonly asked in IIM IPMAT exams.

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IPMAT 2019 - Quantitative Aptitude Question 54

This is a detailed step-by-step solution for IPMAT 2019 - Quantitative Aptitude Question 54. Understand the concept, common mistakes, and expert tips to solve similar questions in IIM IPMAT exam.

IPMAT 2019 - Quantitative Aptitude

1 digit numbers = 2 (1 or 3)
2 digit numbers = 2 × 2
3 digit numbers = 2 × 2 × 2
6 digit numbers = 2 × 2 × 2 × 2 × 2 × 2
Now for 7 digit numbers = 1222222
We cannot place ‘3’ on the 1st position
∴ Total = 2 + 2¹ + 2³+ .....2⁶ + 2⁶
= 190

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