Common difference = 3
10th term = 33
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
2 answers
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
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