what is the sum of the first ten odd numbers
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Answered by
3
first ten odd no. =1 +3+5+7+9+11+13+15+17+19
= 100
hence, your answer is 100
= 100
hence, your answer is 100
Answered by
3
let 1 3 5 7 9 11 13 15 17 19 be the odd no. in A.P
Sn= n/2 [2a+(n-1)d]
a=1 ,n= 10 d=3-1=2
S10= 10/2 [2×1+(10-1)2
S10= 5 [2+18]
S10=5×20
S10=100
so,the sum of first 10 odd no. is 100
Sn= n/2 [2a+(n-1)d]
a=1 ,n= 10 d=3-1=2
S10= 10/2 [2×1+(10-1)2
S10= 5 [2+18]
S10=5×20
S10=100
so,the sum of first 10 odd no. is 100
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