find the sum of the following aps 1.7 ,2.1,2.9 to 21 terms
Answers
Answered by
0
the question is wrong.
As in the first case the common difference is 0.4 while in the next it is 0.8 so the question is wrong
Answered by
0
Answer:
44.1
Step-by-step explanation:
Question is wrong as the difference between them is coming different , but if you take d=0.4 then your answer will be:
a= 1.7
d= 0.4(2.1- 1.7)
we have to find the sum of 21 terms
therefore,
S21 = n/2[2a +(n-1)d]
S21= 21/2 [2*1.7+(21-1)0.4]
S21= 21/2 [3.4+20*0.4]
S21= 21/2[3.4+8]
S21= 21/2 [4.2]
S21= 21/2*42/10
S21= 44.1
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