The sum of all integer between 50 and 350 which ends in 1 is
a) 4566
b) 4877
c) 5539
d) 5880 .
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Answered by
37
Hello friends!!!
51+61+71...+341 is an arithmetic progression
to find the sum of n terms of an ap we use the formula
S=n/2 [2a+(n-1) d]
as n=30 and a= 51
=30/2 [2*51+(30-1) 10]
=15[102+290]
=15* 392
=5880
d) 5880 . is the correct answer
51+61+71...+341 is an arithmetic progression
to find the sum of n terms of an ap we use the formula
S=n/2 [2a+(n-1) d]
as n=30 and a= 51
=30/2 [2*51+(30-1) 10]
=15[102+290]
=15* 392
=5880
d) 5880 . is the correct answer
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uh ...hm..
Answered by
35
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