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Find the sum of all natural …

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Find the sum of all natural numbers b/w 200 and 1502 which are exactly divisible by 3

Posted by Ramakant??? 8306360538 6 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 11 months ago

The AP is 201,204,207,......1500
a=201 d= 3 l=1500
Sn= a+(n-1)d
1500= 201+(n-1)3
1500=201+3n-3
3n=1500-198
3n=1302
n=1302/3
n=434
Sn=N/2(a+l)
a=201
l=1500
n=434
Sn = 434/2 (201 + 15000
Sn = 217 (1701)
Sn = 369117
Therefore Sn=369117

1Thank You

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CBSE > Class 10 > Mathematics