The sum of odd numbers between 15 and 91 is
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17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49+51+53+55+57+59+61+63+65+67+69+71+73+75+77+79+81+83+85+87+89= 1961
Anonymous:
hey so it with formula , and 20 is not an odd no: !
do*
20 , 30 etc are even no:s
he does not mention that we have to do with any formula
:-P
it is to be answered by using formula perhps
but it is not mentioned
btw my answer is also correct
Answered by
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Hey !
Odd no:s between 15 and 91 , in the form of an AP
17 , 19 , 21 , .............. 89
a = 17
d = 2
l = 89
l = a + [ n - 1 ] d
89 = 17 + [ n - 1 ] 2
72 /2 = n - 1
36 = n - 1
n = 37
sum of 37 terms [ odd no:s ] =
n/2 × [ a + l ]
37 / 2 × [ 17 + 89 ]
37/2 × 106
= 1961
hence ,
The sum of odd numbers between 15 and 91 is 1961
Odd no:s between 15 and 91 , in the form of an AP
17 , 19 , 21 , .............. 89
a = 17
d = 2
l = 89
l = a + [ n - 1 ] d
89 = 17 + [ n - 1 ] 2
72 /2 = n - 1
36 = n - 1
n = 37
sum of 37 terms [ odd no:s ] =
n/2 × [ a + l ]
37 / 2 × [ 17 + 89 ]
37/2 × 106
= 1961
hence ,
The sum of odd numbers between 15 and 91 is 1961
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