find the sum of the following APs 2,7,2,.....,to10 terms
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as the sequence given is 2,7,2,7...
the common difference (d) fluctuate from 5 to -5 and 'd' of an AP remain same thus the sequence is not in AP.
the common difference (d) fluctuate from 5 to -5 and 'd' of an AP remain same thus the sequence is not in AP.
Answered by
2
given,a=2 d=7-2=5 and n=10 so,
Sn=n/2{2a+(n-1)d}
putting the values in the equation,
Sn=10/2{2×2+(10-1)5}=5(4+45)=5×49=245
thank u! hope it helps!
Sn=n/2{2a+(n-1)d}
putting the values in the equation,
Sn=10/2{2×2+(10-1)5}=5(4+45)=5×49=245
thank u! hope it helps!
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