Option (a) is correct

Let the seven consecutive odd numbers be x, (x + 2), (x + 4), (x + 6), (x + 8), (x + 10), (x + 12)

Average of seven consecutive odd numbers

= ((x + 2),(x + 4),(x + 6),(x + 8),(x + 10),(x + 12))/7

= 17

(7x+42)/7 = 17

⇒ x = 11

So the numbers are, 11, 13, 15, 17, 19, 21, 23 if next 3 odd numbers are also included,

then,

Average

= (11+13+15+17+19+21+23+25+27+29)/10

= 200/10 = 20

विकल्प (a) सही है

मान लीजिए कि सात क्रमागत विषम संख्याएँ x, (x + 2), (x + 4), (x + 6), (x + 8), (x + 10), (x + 12) हैं।

सात क्रमागत विषम संख्याओं का औसत

((x + 2),(x + 4),(x + 6),(x + 8),(x + 10),(x + 12))/7 = 17

(7x+42)/7 = 17

⇒ x = 11

तो संख्याएं हैं, 11, 13, 15, 17, 19, 21, 23 यदि अगली 3 विषम संख्याओं को भी शामिल किया जाता है,

तब,

औसत

= (11+13+15+17+19+21+23+25+27+29)/10

= 200/10 = 20