0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

# Find the sum of first 12 natural numbers without using the formula or by adding terms directly.

A

58

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
B

78

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

48

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
D

98

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
Open in App
Solution

## The correct option is B 78 The first 12 natural numbers are 1,2,3,4,5,6,7,8,9,10,11,12. Let the sum be "s" s=1+2+3+4+5+6+7+8+9+10+11+12...................(1) We can rewrite "s" as below: s=12+11+10+9+8+7+6+5+4+3+2+1...................(2) Add the equations (1) and (2).we get .. 2s=13+13+13+13+13+13+13+13+13+13+13+13 ⇒2s=13×12 ⇒2s=156 ⇒s=1562 ⇒s=78

Suggest Corrections
7
Join BYJU'S Learning Program
Related Videos
Sum of First N Natural Numbers
MATHEMATICS
Watch in App
Join BYJU'S Learning Program