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4.) find sum of odd number betwen 1 to 200
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Answer:
odd numbers are
1,3,5,7,9
last term is 199 means Tn=199
by using formula
Tn=a+(n-1)d
199=1+(n-1) 2
199+1=(n-1)2
200=(n-1)2
200/2=(n-1)
n=101
Sn=101
by formula Sn=n/2(2a+(n-1)d
S101= 101/2(2+200)
=101 multiply 100=
10500
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