Q. Find the common ratio of the geometric sequence 15,−90,540,…Answer:
Find Common Ratio: To find the common ratio of a geometric sequence, we divide any term by the previous term. Let's divide the second term by the first term to find the common ratio. Common ratio r = (−90)/15
Calculate Common Ratio: Now, let's perform the calculation:r=(−90)/15r=−6
Check Consistency: To ensure that −6 is indeed the common ratio, we should check if the third term divided by the second term also equals −6. Let's check: 540/(−90)
Check Consistency: To ensure that −6 is indeed the common ratio, we should check if the third term divided by the second term also equals −6. Let's check: 540/(−90) Performing the calculation for the check: 540/(−90)=−6 This confirms that the common ratio is consistent across these terms.