The sequence a1, a2, a3, a4. a5 is such that an = a n-1 +5 for 2≤ n ≤ 5. If a5 = 41 what is the value of a1 ?	Pick one
A) 1  B) 6  C) 21  D) 16  E) 21
Here, each value of an is the previous value plus 5   Since the numbers are less, the fastest way to solve this problem is to successively subtract 5 from a5 till you reach a1   a5 = 41   a4 = 36   a3 = 31   a2 = 26   a1 = 21 &lt;&lt;&lt;&lt; Ans 21
<result>C</result>
The sequence a1, a2, a3, a4. a5 is such that an = a n-1 +5 for 2≤ n ≤ 5. If a5 = 41 what is the value of a1 ?