the first and last term of an ap are 5 and 45 respectively if the sum of all its term is 400 find its common difference
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..here in this case d=8/3
Rathor10:
how
ya telling wait
given:a1=5 and last term (l)= 45 ..and sum of all terms of ap=400 then when u put the the value of a1 and last term in the formula for finding sum ..u will get n=16 ..and so again when u would put the value of n =16 in the formula of finding n th term that we have been given =45 then u would get d=8/3
Answered by
6
Here a=5 and l=45
Then sum=n/2(a+l)
400=n/2(5+45)
800=50n
n=16
So we can use formula An=a+(n-1)d
45=5+(16-1)d
40=15d
d=40/15=8/3
Then sum=n/2(a+l)
400=n/2(5+45)
800=50n
n=16
So we can use formula An=a+(n-1)d
45=5+(16-1)d
40=15d
d=40/15=8/3
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