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select the next number in the series: 298 209 129 58 -4?

a) -13b) -93c) -66d) -57

2 Answers

L
Lamar Hirthe

Feb 20, 2025

Take the differences.... 298 - 209 = 89209 - 129 = 80129 - 58 = 71 58 - (-4) = 62The differences drop by 9 each time. So, the next number is (-4) - x = 53, or x = -57. Answer is d.... Show More
L
Lamar Hirthe

Feb 20, 2025

298 - 209 = 89209 - 129 = 80 (or 89 - 9)129 - 58 = 71 (or 80 - 9) see?58 -(-4) = 58+4= 62 (or 71 - 9) , then-4 - 53 = -57 <--- the answer is d)... Show More

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