The sequence of four numbers $a_1, a_2, a_3$ and $a_4$ is such that each number after the first is $a_1-1$ greater

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VJesus12: Legendary Member; Posts: 2276; Joined: Sat Oct 14, 2017 6:10 amFollowed by: 3 members

by VJesus12 » Sat Jun 05, 2021 4:22 am

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The sequence of four numbers $a_1, a_2, a_3$ and $a_4$ is such that each number after the first is $a_1-1$ greater than the preceding number. What is the value of $a_1?$

(1) $a_2=15$

(2) $a_4=29$

Answer: D

Source: GMAT Prep

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Source: Beat The GMAT — Data Sufficiency | Sat Jun 05, 2021 4:22 am

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