75 से 97 तक की प्राकृतिक संख्याओं का योग होगा
(a) 2008 (b) 1985 (c) 1895 (d) 1978
Answers
Answered by
0
Answer:
I think options b is right
is it right
Answered by
2
97= a+ (n-1)d
97 = 75+(n-1)1
97 = 75+n-1
n = 23
Sn = n/2(a+l)
=23/2(75+97)
= 23×86
= 1978
(d) is correct answer
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