What is the 9th term of the sequence : - 2, - 4, - 6, ............................ , - 100?
A
- 16
B
- 18
C
- 20
D
22
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Question: What is the 9th term of the sequence : - 2, - 4, - 6, ............................ , - 100?
Solution:
Here,
- 4 - (- 2) = - 4 + 2 = - 2
- 6 - (- 4) = - 6 + 4 = - 2
∴ d = - 2
a = - 2
n = 9
∴ The 9th term of the sequence = a + (n - 1)d
= - 2 + (9 - 1) (- 2)
= - 2 + 8 (- 2)
= - 2 - 16
= - 18
0
Updated: 3 days ago
In a series of 5 consecutive odd numbers if 13 is the 5th number, what is the 3rd number in the series?
Created: 3 days ago
A
5
B
7
C
9
D
11
Question: In a series of 5 consecutive odd numbers if 13 is the 5th number, what is the 3rd number in the series?
Solution:
5th odd number = 13
4th odd number = 11
3rd odd number = 9
2nd odd number = 7
1st odd number = 5
0
Updated: 3 days ago
a ≤ (a/2) + 3 এর সমাধান কত?
Created: 2 weeks ago
A
a ≤ 2
B
a ≤ 1
C
a ≤ 6
D
a ≤ 3
সমাধান:
a ≤ (a/2) + 3
⇒ 2a ≤ 2{(a/2) + 3}
⇒ 2a ≤ a + 6
⇒ 2a - a ≤ a + 6 - a
⇒ a ≤ 6
0
Updated: 2 weeks ago
যদি nPr = 720 এবং nCr = 120 হয়, তাহলে r এর মান কত?
Created: 1 month ago
A
3
B
4
C
5
D
6
সমাধান:
দেওয়া আছে,
nPr = 720 এবং nCr = 120
আমরা জানি,
nPr = nCr × r!
⇒ 720 = 120 × r!
⇒ r! = 720/120
⇒ r! = 6
⇒ r! = 3!
∴ r = 3
0
Updated: 1 month ago
