Question

How many stars will be there in Row 10 of the given pattern?

• A. 7
• B. 9
• C. 8
• D. 10

Answer 1

The correct option is B 9

Solution:
Say:
Let us observe the pattern from the given image, and calculate the answer.
Step:

• Row 1 has 0 stars.
• Row 2 has 1 star
• Row 3 has 2 stars
• Row 4 has 3 stars.
• So, the pattern is increasing 1 star in every step.
• So, Row 5: 4 stars, Row 6: 5 stars, Row 7: 6 stars, Row 8: 7 stars, Row 9: 8 stars, Row 10: 9 stars.
• Hence, 9 is the correct answer.

Probing Question. Is there any other way to get the answer without calculating the number of stars in each row?
Ans: Yes. As we can see the number of stars is 1 less than the row number, (Row 1 has 0 stars, Row 2 has 1 star, Row 3 has 2 stars, and so on) so the number of stars in Row 10 = 10 – 1 = 9.