PLEASE SOLVE THIS QUESTION ALSO TELL ME THE DIFFERENCE BETWEEN SN AND N... PLZZZ
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Hi
Let the no. of terms be n
Sn={n/2}(2a+(n-1)d)
Sn =210
a=2
d=2
210={n/2}(4+(n-1)2)
210=n(n+1)
210=n²+n
n=-15 or =14
-15 is not possible because no.of terms can not be negative.
n=14
Let the no. of terms be n
Sn={n/2}(2a+(n-1)d)
Sn =210
a=2
d=2
210={n/2}(4+(n-1)2)
210=n(n+1)
210=n²+n
n=-15 or =14
-15 is not possible because no.of terms can not be negative.
n=14
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