find the sum of all the natural numbers which are less than 250 and which are divisible by 7
Answers
Answered by
1
Answer:
230125
Step-by-step explanation:
Sn=n/2 (2a+n-1)d
S250=250/2 (14+249)7
=125 (1841)
=230125
Answered by
2
Answer:
4410
Step-by-step explanation:
natural nos less than 250 divisible by 7 forms an AP
7,14,21,..........245
a=7,d=14-7=7. and. l or. an =245
an=a+(n-1)d
245=7+(n-1)7
n-1=34
n=35
sum of 35 terms =n/2[2a+(n-1)d]
=35/2[14+238]
=35/2*252
=4410
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