find the sum of 7+10+1/2+14+............+84
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a=7
l=84
n=?
d=10-7
=3
to find n=(l-a÷d)+1
after finding the n find the sum using
Sn=n/2 (2a+(n-1)d)
with using these formulae find ur answer
l=84
n=?
d=10-7
=3
to find n=(l-a÷d)+1
after finding the n find the sum using
Sn=n/2 (2a+(n-1)d)
with using these formulae find ur answer
Answered by
16
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