Write the formula do sum an AP. When first term, last term and number of terms are given. Also find the 11th term of AP. 90,80,70,60 ......
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sn = n/2*2a+ (n-1)d
here d= -10
a= 90
a11= a+ 10d
put the values in this and get ur ans
ans = -190
aaminathabrez:
A11??
wat s it a11
and wat is n
n is the particular term
a11 is the no. who is at 11th position on a ap
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