MTS 21 25-07-2022 Shift 3


Question 1

The average of a set of 15 consecutive even numbers is 64. What is the difference between the largest and the smallest
numbers belonging to this set?
 

15 क्रमागत सम संख्याओं के समुच्चय का औसत 64 है। इस समुच्चय की सबसे बड़ी और सबसे छोटी संख्या का
अंतर कितना है?
 


Options

A

B

C

D


Solution:

Correct Answer:

B


As we know consecutive even numbers series is a an arithmetic progression and diffrence between the two terms is 2

Formula for finding nth term in AP is 

an = a+(n-1)d

In the question there is 15 terms in the series so 

Smallest term = first term = a  and Largest term = final term which is 15th =a15

a15 = a+(15-1)2

a15 - a = 28

जैसा कि हम जानते है कि क्रमागत सम संख्याओ का समुच्चय एक समांतर श्रेणी है जिसके दो क्रमागत पदों के बीच का अंतर 2 है 

nth पद के मान निकालने  का सूत्र 

an = a+(n-1)d

प्रशन में 15 पदों  की श्रेणी है

सबसे छोटा पद  = पहला पद = a  तथा सबसे बड़ा पद = अंतिम पद जो 15 वाँ  है = a15

a15 = a+(15-1)2

a15 - a = 28

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