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বাংলা
Select the missing numbers from the given responses.
4, ? , 144, 400, 900, 1764
নিচের সিরিজে অনুপস্থিত সংখ্যা নির্বাচন করুন: 4, ?, 144, 400, 900, 1764
Practice MCQ for SSC, UPSC, RRB Exams
A. 25
A. 25
B. 36
B. 36
C. 49
C. 49
D. 100
D. 100
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
The given series is:
4, ?, 144, 400, 900, 1764
.
Observe that the numbers are
perfect squares
:
4 = 2²
144 = 12²
400 = 20²
900 = 30²
1764 = 42²
Take the
square roots
of the series to find the pattern:
2, ?, 12, 20, 30, 42
.
Find the
differences between consecutive roots
:
12 − ? = ?
20 − 12 = 8
30 − 20 = 10
42 − 30 = 12
Notice the differences form a pattern:
6, 8, 10, 12
(increasing by 2).
The missing root before 12 = 12 − 6 =
6
.
Square the missing root to get the missing number: 6² =
36
.
Thus, the complete series is:
4, 36, 144, 400, 900, 1764
.
প্রদত্ত সিরিজ হলো:
4, ?, 144, 400, 900, 1764
পর্যবেক্ষণ করলে দেখা যায় যে সংখ্যাগুলো হলো
পূর্ণ বর্গ সংখ্যা
:
4 = 2²
144 = 12²
400 = 20²
900 = 30²
1764 = 42²
সিরিজের
বর্গমূল
বের করুন:
2, ?, 12, 20, 30, 42
একই ধাপে বর্গমূলের মধ্যে
আপেক্ষিক পার্থক্য
বের করুন:
12 − ? = ?
20 − 12 = 8
30 − 20 = 10
42 − 30 = 12
পার্থক্যগুলো একটি ধারা নির্দেশ করছে:
6, 8, 10, 12
(প্রত্যেকটি 2 করে বৃদ্ধি পাচ্ছে)।
12-এর আগে অনুপস্থিত বর্গমূল = 12 − 6 =
6
অতএব, অনুপস্থিত সংখ্যা = 6² =
36
সম্পূর্ণ সিরিজ:
4, 36, 144, 400, 900, 1764
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