`{:(7,21,15),(49,441,225),(98,882,450),(140,1302,?):}`

Options

A. 6750
B. 690
C. 1380
D. 660

Answer

D

Explanation

जिस प्रकार,
`7 rArr 7 xx 7 =49 rArr 49 xx 2 = 98`
`rArr 98 + (49 + 7) = 140`
`21 rArr 21 xx 21 = 441 rArr 441 xx 2`
`= 882 rArr 882 + (441 - 21)`
`= 882 + 42 = 1302`
उसी प्रकार,
`15 rArr 15 xx 15 = 225 rArr 225 xx 2`
`= 450 rArr 450 + (225 - 15) = 660`