without actual addition find the sum of 1+3+5+7+...+31 = ?
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Answered by
1
Answer:
Answer. Therefore, answer: - the sum 1+3+5+7+9+11+13+15+17 is 81.
Step-by-step explanation:
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Answered by
0
Answer:
d=2
a=1
an=31
an=a+(n-1) d
31=1+(n-1) 2
31=1+2n-2
31+1=2n
32/2=n
16=n
next formula of sum
sn=n/2(2a+(n-1) d)
sn=8(2×1+(16-1) 2)
sn=8(2+30)
sn=8(32)
sn=256
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