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The average of four consecutive numbers. A,B,C and D is 49.5 . What is the product of B and D ?

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The average of four consecutive numbers. A,B,C and D is 49.5 . What is the product of B and D ?
A. 2499
B. 2352
C. 2450
D. 2550
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Correct Answer - A
Let A =x, B=x+1, C=x+2 , D=x+3
`x+x+1x+2+x=198`
or , `4x+6=198`
or, `x=48`
`implies B=49,D=51`
`therefore` Product of B and D `=49xx51=2499`
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