1.

Find the sum 3,7,11,....up to 40terms

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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..... ☺



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