Using ap find the sum of all 3 digit natural numbers which are multiples of 7
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17
Answer:
105,112,119..............994
a=105 , d=7 , l=an=994
an=a+(n-1)d
994=105+(n-1)7
994=105+7n-7
994=98+7n
7n=896
n=896/7
n=128
Sn=128/2[105+994]
Sn = 64[1099]
Sn=70336
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n = 128
sn = 70336
mark as brilliantly
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