Q. Type the missing number in this sequence:30, 39, _, 57, 66, 75, 84
Observe Pattern: Let's observe the pattern in the sequence to determine the rule that applies to the numbers given.30,39,_____, 57,66,75,84We notice that each number is increasing by a certain amount. To find out the common difference, we subtract the second number from the third number in the sequence.66−57=9
Determine Common Difference: Now, let's check if this difference of 9 applies to other consecutive numbers in the sequence.75−66=984−75=9It seems that the sequence is increasing by 9 each time.
Check Consistency: To find the missing number, we can subtract 9 from 57, the number that comes after the missing number.57−9=48Therefore, the missing number in the sequence should be 48.
Find Missing Number: Let's verify our answer by checking if adding 9 to the missing number gives us the next number in the sequence.48+9=57Since 57 is the next number in the sequence, our calculation is correct.