There are 6 red, 5 blue, and 7 yellow balls in a bag. If a ball is picked at random, what is the probability of having either a red or a blue ball?
A
5/18
B
1/3
C
2/3
D
11/18
উত্তরের বিবরণ
Question: There are 6 red, 5 blue, and 7 yellow balls in a bag. If a ball is picked at random, what is the probability of having either a red or a blue ball?
Solution:
ব্যাগে মোট বলের সংখ্যা = 6 + 5 + 7 = 18 টি।
লাল বল পাওয়ার সম্ভাবনা = 6/18
নীল বল পাওয়ার সম্ভাবনা = 5/18
∴ লাল অথবা নীল বল পাওয়ার সম্ভাবনা = (6/18) + (5/18)
= (6 + 5)/18
= 11/18
0
Updated: 1 month ago
4√2 এর 2 ভিত্তিক লগ কত?
Created: 1 month ago
A
3/2
B
5/2
C
1
D
2/3
প্রশ্ন: 4√2 এর 2 ভিত্তিক লগ কত?
সমাধান:
4√2 এর 2 ভিত্তিক লগ
= log2(4√2)
= log24 + log2(√2) [loga(MN) = logaM + logaN]
= log2(22) + log2(21/2)
= 2 × log22 + (1/2) × log22 [loga(bk) = k × logab]
= 2 + 1/2
= 5/2
0
Updated: 1 month ago
Four girls
are sitting on a bench to be photographed. Asma is to the left of Rani. Rubi is
to the right of Rani. Rita is between Rani and Rubi. Who would be third from
the left in the photograph?
Created: 1 month ago
A
Rita
B
Rani
C
Asma
D
Rubi
Question: Four girls are sitting on a bench to be photographed. Asma is to the left of Rani. Rubi is to the right of Rani. Rita is between Rani and Rubi. Who would be third from the left in the photograph?
Solution:
Asma is to the left of Rani.
Asma ⇔ Rani
Rubi is to the right of Rani.
Rani ⇔ Rubi
Rita is between Rani and Rubi.
Rani ⇔ Rita ⇔ Rubi
∴ Asma ⇔ Rani ⇔ Rita ⇔ Rubi.
Rita would be third from the left in the photograph
0
Updated: 2 weeks ago
a2 + b2 = 13 এবং ab = 6 হলে, a4 + b4 এর মান কত?
Created: 2 months ago
A
102
B
97
C
60
D
169
প্রশ্ন: a2 + b2 = 13 এবং ab = 6 হলে, a4 + b4 এর মান কত?
সমাধান:
দেওয়া আছে,
a2 + b2 = 13 এবং ab = 6
প্রদত্ত রাশি,
a4 + b4
=(a2)2 + (b2)2
= (a2 + b2)2 - 2a2b2
= (a2 + b2)2 - 2(ab)2
= (13)2 - 2 × (6)2
= 169 - 72
= 97
0
Updated: 2 months ago
