without adding find the sum fo 13 odd numbers
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Answer:
the answer for given question is 169
Step-by-step explanation:
1,3,5,7,9....
t1=1 ,n = 13,d=3-1=2
Sn= n/2 {2a+(n-1)d}
S13= 13/2 { 2+(13-1)2}
= 13/2 ×(26)
= 13×13
= 169
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