4 Answers

0 like 0 dislike
by
selected by
 
Best answer

১ থেকে ৯৯ পর্যন্ত সংখ্যাগুলোর যোগফল ৪৯৫০

0 like 0 dislike
by
(১+১০০)x৫০-১০০

=১০১x৫০-১০০

=৫০৫০-১০০

=৪৯৫০
0 like 0 dislike
by
(১+৯৯)x৪৯+৫০

=১০০x৪৯+৫০
=৪৯০০+৫০
=৪৯৫০
0 like 0 dislike
by
$S_n=\frac{n}{2}\left(a_1+a_n\right)$

Or, $S_{99}=\frac{99}{2}\left(1+99\right)$

Or, $S_{99}=\frac{99}{2}\times100$

Or, $S_{99}=99\times50$

Or, $S_{99}=4950$

Related questions

10.4k questions

10.5k answers

122 comments

28 users

Welcome to QnAfy !

Ask questions, find answers, and spread the light of knowledge like the sun. On QnAfy, only registered users can post questions and answers.

If you are a teacher or student, you may register using your own name, your school/coaching center’s name, or your website’s name to actively contribute by asking or answering questions. This will help increase your or your institution’s visibility, and in the case of a website, it will boost your backlink profile as well.

So, Register Now

fb Group | fb Page
WhatsApp Message
Join Telegram Group

QnAfy – Where curiosity meets clarity.

Categories

For the best experience with math, please rotate your mobile to landscape mode or use a tablet, laptop, or PC for optimal viewing.
...