Discussion
90, 380, 870, 1560,…..
Answer: B
Correct answer: 2450
Each term is a multiple of ten times the number one less: \( 10\times9=90 \), \( 20\times19=380 \), \( 30\times29=870 \), \( 40\times39=1560 \), so the next is \( 50\times49 = \mathbf{2450} \).
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