The 6th term of an A.P is twice the third and the first term is 3. Find the common difference and the 10th term
As usual, the robot tutor is wrong on even this simple question.
Real solution:
a+5d = 2(a+2d)
a+5d = 2a + 4d
a = d
also a = 3
so d = 3
10th term = a + 9d = 30
check:
the sequence is
3, 6, 9, 12, 15, 18, 21, 24, 27, 30 , note the 10th is 30, not 33
Common difference = 3
10th term = 33