ଯଦି a ∶ b = 2 ∶ 7 ଏବଂ 343 ହେଉଛି a ଏବଂ b ସହିତ ତୃତୀୟ ଆନୁପାତିକ, ତେବେ b - a ର ମୂଲ୍ୟ ହେଉଛି:

1
98
2
70
3
49
4
126

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