Find the sum 3,7,11,....up to 40terms
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Answered by
16
Answer:
Answer:
Heya......❤✌
Here,
a= 3, n=40, d=4
Now, sum of the terms is given by the formula.
Sn= n/2(2a+(n-1)d)
S40= 40/2(6+156)
S40=20×162
S40=3240
The sum is 3240.
Hope it's helpful..... ☺
Answered by
3
Answer:
a= 3, n=40, d=4
Sn= n/2(2a+(n-1)d)
s40= 40/2(2*3+39*4)
s40= 40/2(6+156)
S40=20×162
S40=3240
Therefore sum upto 40 terms is 3240.
Step-by-step explanation:
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